Horizon3.ai

Lead the Client Platform organization, managing engineering managers and overseeing secure image build and release workflows and reliable over-the-air updates for customer-deployed runners. | Requires substantial platform leadership and experience with containerized customer-deployed software, secure software supply chains, OTA updates at scale, Linux operations, and Go, Python, or C++. | Get to Know Us Horizon3.ai is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZero™ platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and false positives, resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn-it-alls, committed to a culture of respect, collaboration, ownership, and results. As a remote first company, we require minimum 25Mbps consumer grade broadband connection. What You'll Do You will lead Client Platform - the team responsible for the software that lives in customer environments and makes NodeZero's autonomous pentests possible. Client Platform owns two sub-teams: Image Build & Release (the factory that produces and signs the NodeZero runner container image) and OTA Services (the system that keeps runners current across thousands of customer environments). Every pentest NodeZero runs depends on this team's work being reliable, secure, and fast. • Team Building & Culture: Build, mentor, and grow Client Platform to ~10 engineers across Image Build & Release and OTA Services. You will directly manage the Engineering Managers of both sub-teams and set the technical and cultural direction for the full org. Establish engineering norms and a culture of ownership for a team whose software runs in environments you cannot control. • Image Build & Release: Lead end-to-end CI/CD workflows to create, sign, and reliably publish the NodeZero runner container image. Own software supply chain security: reproducible builds, image signing, SBOM generation, and vulnerability scanning in CI. • OTA Services: Architect and operate the over-the-air update delivery system that keeps NodeZero runners current across thousands of customer environments - reliably, securely, and without requiring manual customer IT intervention. • Security Research Partnership: Collaborate closely with Security Research to ensure the runner seamlessly executes new autonomous pentest capabilities as they ship. • Act as a Product Owner: Partner with product managers, security researchers, and customer success to manage the client-side roadmap. What You'll Bring Platform Leadership & Architecture • Demonstrated expertise leading teams that design, build, and operate containerized software (Docker, VM images) deployed into on-premise or customer-managed environments. • Experience implementing robust software supply chain practices - secure builds, image signing (cosign, Notary), reproducible builds, and vulnerability scanning in CI. • Experience designing and operating OTA update mechanisms for distributed agents or edge software at scale - including staged rollouts, rollback, and delivery verification. • Ability to reason about correctness in opaque, customer-controlled environments where you cannot observe failure modes directly. Team Building & Engineering Culture • Experience building or significantly growing an engineering team - including hiring, onboarding, and establishing engineering norms tailored for shipped software. • Proven ability to define and instill engineering culture: rigorous code review standards, robust testing across diverse customer environments, and a strong culture of ownership. • Drives high-impact architecture decisions rigorously - requires design documents, runs structured reviews, builds consensus, and ensures decisions account for customer environment variables. Technical Expertise • Proficient in Go (preferred), Python, or C++. • Strong Linux OS-level operations: container runtimes, networking in corporate environments, systemd, process isolation. • Experience with CI/CD pipelines for building and signing container images (cosign, Notary v2, or equivalent). • Familiarity with OTA update protocols and frameworks: TUF (The Update Framework), Omaha, or custom mechanisms. • Understanding of TLS, certificate pinning, and secure software delivery in hostile network environments. Nice to Haves • Exposure to cybersecurity, pentesting tools, or vulnerability remediation. • Experience with cross-platform agents (Windows/Linux) and endpoint telemetry. • Background in software running in air-gapped or restricted network environments. • Familiarity with SLSA supply chain security framework. Travel Required We are a fully remote company, and this job may require up to 5% of travel to be successful. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $242,250 - $275,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: This role may also be eligible for an equity package (in the form of stock options). If any other compensation benefits apply, they will be discussed during the interview process. Perks of Horizon3.ai • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Remote Work: We are a 100% remote company. Enjoy the flexibility to work in the way that supports you and brings out your best. • Competitive Compensation: We offer competitive salary and benefits which includes health, vision & dental care for you and your family, a flexible vacation policy, and generous parental leave. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice. Application Note In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Lead and improve developer tooling, CI/CD, build systems, and release workflows to enhance software delivery and developer experience. | Senior-level experience in developer experience, CI/CD, containerization, and leadership with strong communication and mentoring skills. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. About the Role We are looking for a Staff Developer Experience Engineer to help shape how Horizon3 engineers build, test, release, and operate software. The Developer Experience team owns the foundations connecting local development to production delivery: developer tooling, CI/CD, build systems, container base images, artifact promotion, release gates, and approved agentic-development workflows. You will define technical direction, lead complex initiatives across engineering, and build reusable paths that improve delivery speed, quality, security, and confidence. This is a hands-on technical leadership role for an engineer who enjoys solving ambiguous problems, influencing across teams, and making the software lifecycle easier to use and operate. What You'll Do Developer Platform Strategy, Delivery & Operations • Define the architecture and roadmap for local development, repository tooling, CI/CD, build systems, and release workflows. • Lead high-impact initiatives across engineering that reduce manual coordination and standardize the path from code change to production. • Build reusable GitLab CI/CD templates, runner capabilities, developer workflows, test gates, artifact promotion, release manifests, and rollback paths. • Establish sustainable practices for shared container images, build performance, reproducibility, scanning, signing, provenance, and supply-chain security. • Improve developer workflow and delivery observability through useful measures of setup time, pipeline health, release performance, and adoption. • Partner with Platform, Security, QA, and feature teams to make delivery foundations reliable, secure, and easy to consume. Technical Leadership & Enablement • Establish standards and paved paths for developer workflows, build and release engineering, and approved AI-assisted development. • Design safe agentic-development workflows that integrate with code review, testing, scanning, permissions, auditability, and Security requirements. • Turn repeated developer friction into reusable tooling, templates, documentation, migration guidance, and runbooks. • Mentor engineers, develop technical owners, and raise the engineering bar across Developer Experience and Horizon3. • Communicate complex technical decisions clearly and build alignment across Platform, Application Engineering, Data Engineering, Security, QA, Product, and Program Management. • Participate in design reviews, operational reviews, incident response, and continuous improvement. What You'll Bring Required Qualifications • 8+ years of experience in Developer Experience, Developer Productivity, Build/Release Engineering, Platform Engineering, SRE, DevOps, or software engineering with substantial tooling and delivery ownership. • Deep experience designing and operating CI/CD systems, preferably GitLab CI/CD and self-hosted runners. • Experience with container builds, Docker or OCI images, artifact repositories, and reproducible builds. • Strong understanding of Kubernetes-based development or delivery workflows. • Experience implementing automated tests, security checks, release gates, progressive delivery, and rollback. • Proficiency in Go and Python for automation, developer tooling, or platform services. • Strong understanding of software supply-chain security, dependencies, image vulnerabilities, provenance, secrets, and least privilege. • Demonstrated success leading complex initiatives across multiple teams and driving adoption of shared capabilities. • Excellent written and verbal communication skills. • Experience mentoring engineers and influencing technical direction without relying on formal authority. Preferred Qualifications • Internal developer platform, paved-road, service-template, or developer-portal experience. • Shared language/runtime base images, image signing, SBOMs, or provenance-control experience. • GitLab Runner fleets, CI optimization, build caching, or multi-repository release-system experience. • Local Kubernetes, dev containers, Docker Compose, Orbstack, Skaffold, ArgoCD, or GitOps experience. • AI-assisted or agentic engineering workflow experience. • OpenTelemetry, Datadog, pipeline telemetry, or developer-productivity metrics experience. • Security-sensitive, regulated, or cybersecurity experience. Our Developer Experience Stack • GitLab, GitLab CI/CD, and private runner fleets • Shared CI/CD templates and pipeline management • Docker/OCI images, artifact repositories, and shared base images • Kubernetes, EKS, Helm, Skaffold, and ArgoCD • AWS and cloud-native development environments • Go, Python, TypeScript, shell scripting, and repository tooling • OpenTelemetry, Datadog, and pipeline/deployment observability • Approved AI coding tools, including Claude Code for approved engineering use cases Exact tool matches are less important than strong software-engineering fundamentals, platform judgment, empathy for developers, and a track record of improving delivery systems at scale. What Success Looks Like • Engineering teams adopt clear, reliable paved paths from local development through production. • Shared CI/CD, build, and release capabilities reduce friction and manual coordination. • The same validated artifact or commit moves predictably through environments. • Base images, build components, and delivery workflows are secure, current, traceable, and easy to consume. • Approved AI-assisted workflows improve productivity without bypassing review, testing, or security. • Developer Experience has clear standards, strong adoption, measurable outcomes, and multiple technical owners. • You are trusted across Engineering to lead difficult developer-workflow and delivery decisions. Why Join Us You'll shape the engineering system behind a rapidly evolving cybersecurity product used by organizations around the world. Your work will improve how every engineering team builds and operates NodeZero while establishing a new, high-leverage technical function at Horizon3. Travel Occasional travel may be required for company onsite meetings and team collaboration. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice. Application Note In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Lead and improve developer tooling, CI/CD, build systems, and release workflows to enhance software delivery and developer experience. | Requires 8+ years in developer experience or related roles, deep CI/CD and container experience, proficiency in Go and Python, strong leadership and communication skills. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. About the Role We are looking for a Staff Developer Experience Engineer to help shape how Horizon3 engineers build, test, release, and operate software. The Developer Experience team owns the foundations connecting local development to production delivery: developer tooling, CI/CD, build systems, container base images, artifact promotion, release gates, and approved agentic-development workflows. You will define technical direction, lead complex initiatives across engineering, and build reusable paths that improve delivery speed, quality, security, and confidence. This is a hands-on technical leadership role for an engineer who enjoys solving ambiguous problems, influencing across teams, and making the software lifecycle easier to use and operate. What You'll Do Developer Platform Strategy, Delivery & Operations • Define the architecture and roadmap for local development, repository tooling, CI/CD, build systems, and release workflows. • Lead high-impact initiatives across engineering that reduce manual coordination and standardize the path from code change to production. • Build reusable GitLab CI/CD templates, runner capabilities, developer workflows, test gates, artifact promotion, release manifests, and rollback paths. • Establish sustainable practices for shared container images, build performance, reproducibility, scanning, signing, provenance, and supply-chain security. • Improve developer workflow and delivery observability through useful measures of setup time, pipeline health, release performance, and adoption. • Partner with Platform, Security, QA, and feature teams to make delivery foundations reliable, secure, and easy to consume. Technical Leadership & Enablement • Establish standards and paved paths for developer workflows, build and release engineering, and approved AI-assisted development. • Design safe agentic-development workflows that integrate with code review, testing, scanning, permissions, auditability, and Security requirements. • Turn repeated developer friction into reusable tooling, templates, documentation, migration guidance, and runbooks. • Mentor engineers, develop technical owners, and raise the engineering bar across Developer Experience and Horizon3. • Communicate complex technical decisions clearly and build alignment across Platform, Application Engineering, Data Engineering, Security, QA, Product, and Program Management. • Participate in design reviews, operational reviews, incident response, and continuous improvement. What You'll Bring Required Qualifications • 8+ years of experience in Developer Experience, Developer Productivity, Build/Release Engineering, Platform Engineering, SRE, DevOps, or software engineering with substantial tooling and delivery ownership. • Deep experience designing and operating CI/CD systems, preferably GitLab CI/CD and self-hosted runners. • Experience with container builds, Docker or OCI images, artifact repositories, and reproducible builds. • Strong understanding of Kubernetes-based development or delivery workflows. • Experience implementing automated tests, security checks, release gates, progressive delivery, and rollback. • Proficiency in Go and Python for automation, developer tooling, or platform services. • Strong understanding of software supply-chain security, dependencies, image vulnerabilities, provenance, secrets, and least privilege. • Demonstrated success leading complex initiatives across multiple teams and driving adoption of shared capabilities. • Excellent written and verbal communication skills. • Experience mentoring engineers and influencing technical direction without relying on formal authority. Preferred Qualifications • Internal developer platform, paved-road, service-template, or developer-portal experience. • Shared language/runtime base images, image signing, SBOMs, or provenance-control experience. • GitLab Runner fleets, CI optimization, build caching, or multi-repository release-system experience. • Local Kubernetes, dev containers, Docker Compose, Orbstack, Skaffold, ArgoCD, or GitOps experience. • AI-assisted or agentic engineering workflow experience. • OpenTelemetry, Datadog, pipeline telemetry, or developer-productivity metrics experience. • Security-sensitive, regulated, or cybersecurity experience. Our Developer Experience Stack • GitLab, GitLab CI/CD, and private runner fleets • Shared CI/CD templates and pipeline management • Docker/OCI images, artifact repositories, and shared base images • Kubernetes, EKS, Helm, Skaffold, and ArgoCD • AWS and cloud-native development environments • Go, Python, TypeScript, shell scripting, and repository tooling • OpenTelemetry, Datadog, and pipeline/deployment observability • Approved AI coding tools, including Claude Code for approved engineering use cases Exact tool matches are less important than strong software-engineering fundamentals, platform judgment, empathy for developers, and a track record of improving delivery systems at scale. What Success Looks Like • Engineering teams adopt clear, reliable paved paths from local development through production. • Shared CI/CD, build, and release capabilities reduce friction and manual coordination. • The same validated artifact or commit moves predictably through environments. • Base images, build components, and delivery workflows are secure, current, traceable, and easy to consume. • Approved AI-assisted workflows improve productivity without bypassing review, testing, or security. • Developer Experience has clear standards, strong adoption, measurable outcomes, and multiple technical owners. • You are trusted across Engineering to lead difficult developer-workflow and delivery decisions. Why Join Us You'll shape the engineering system behind a rapidly evolving cybersecurity product used by organizations around the world. Your work will improve how every engineering team builds and operates NodeZero while establishing a new, high-leverage technical function at Horizon3. Travel Occasional travel may be required for company onsite meetings and team collaboration. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice. Application Note In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Lead and define developer tooling, CI/CD, build systems, and release workflows to improve software delivery and developer experience. | 8+ years experience in developer productivity or platform engineering, strong CI/CD and container knowledge, proficiency in Go and Python, and leadership in cross-team initiatives. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. About the Role We are looking for a Staff Developer Experience Engineer to help shape how Horizon3 engineers build, test, release, and operate software. The Developer Experience team owns the foundations connecting local development to production delivery: developer tooling, CI/CD, build systems, container base images, artifact promotion, release gates, and approved agentic-development workflows. You will define technical direction, lead complex initiatives across engineering, and build reusable paths that improve delivery speed, quality, security, and confidence. This is a hands-on technical leadership role for an engineer who enjoys solving ambiguous problems, influencing across teams, and making the software lifecycle easier to use and operate. What You'll Do Developer Platform Strategy, Delivery & Operations • Define the architecture and roadmap for local development, repository tooling, CI/CD, build systems, and release workflows. • Lead high-impact initiatives across engineering that reduce manual coordination and standardize the path from code change to production. • Build reusable GitLab CI/CD templates, runner capabilities, developer workflows, test gates, artifact promotion, release manifests, and rollback paths. • Establish sustainable practices for shared container images, build performance, reproducibility, scanning, signing, provenance, and supply-chain security. • Improve developer workflow and delivery observability through useful measures of setup time, pipeline health, release performance, and adoption. • Partner with Platform, Security, QA, and feature teams to make delivery foundations reliable, secure, and easy to consume. Technical Leadership & Enablement • Establish standards and paved paths for developer workflows, build and release engineering, and approved AI-assisted development. • Design safe agentic-development workflows that integrate with code review, testing, scanning, permissions, auditability, and Security requirements. • Turn repeated developer friction into reusable tooling, templates, documentation, migration guidance, and runbooks. • Mentor engineers, develop technical owners, and raise the engineering bar across Developer Experience and Horizon3. • Communicate complex technical decisions clearly and build alignment across Platform, Application Engineering, Data Engineering, Security, QA, Product, and Program Management. • Participate in design reviews, operational reviews, incident response, and continuous improvement. What You'll Bring Required Qualifications • 8+ years of experience in Developer Experience, Developer Productivity, Build/Release Engineering, Platform Engineering, SRE, DevOps, or software engineering with substantial tooling and delivery ownership. • Deep experience designing and operating CI/CD systems, preferably GitLab CI/CD and self-hosted runners. • Experience with container builds, Docker or OCI images, artifact repositories, and reproducible builds. • Strong understanding of Kubernetes-based development or delivery workflows. • Experience implementing automated tests, security checks, release gates, progressive delivery, and rollback. • Proficiency in Go and Python for automation, developer tooling, or platform services. • Strong understanding of software supply-chain security, dependencies, image vulnerabilities, provenance, secrets, and least privilege. • Demonstrated success leading complex initiatives across multiple teams and driving adoption of shared capabilities. • Excellent written and verbal communication skills. • Experience mentoring engineers and influencing technical direction without relying on formal authority. Preferred Qualifications • Internal developer platform, paved-road, service-template, or developer-portal experience. • Shared language/runtime base images, image signing, SBOMs, or provenance-control experience. • GitLab Runner fleets, CI optimization, build caching, or multi-repository release-system experience. • Local Kubernetes, dev containers, Docker Compose, Orbstack, Skaffold, ArgoCD, or GitOps experience. • AI-assisted or agentic engineering workflow experience. • OpenTelemetry, Datadog, pipeline telemetry, or developer-productivity metrics experience. • Security-sensitive, regulated, or cybersecurity experience. Our Developer Experience Stack • GitLab, GitLab CI/CD, and private runner fleets • Shared CI/CD templates and pipeline management • Docker/OCI images, artifact repositories, and shared base images • Kubernetes, EKS, Helm, Skaffold, and ArgoCD • AWS and cloud-native development environments • Go, Python, TypeScript, shell scripting, and repository tooling • OpenTelemetry, Datadog, and pipeline/deployment observability • Approved AI coding tools, including Claude Code for approved engineering use cases Exact tool matches are less important than strong software-engineering fundamentals, platform judgment, empathy for developers, and a track record of improving delivery systems at scale. What Success Looks Like • Engineering teams adopt clear, reliable paved paths from local development through production. • Shared CI/CD, build, and release capabilities reduce friction and manual coordination. • The same validated artifact or commit moves predictably through environments. • Base images, build components, and delivery workflows are secure, current, traceable, and easy to consume. • Approved AI-assisted workflows improve productivity without bypassing review, testing, or security. • Developer Experience has clear standards, strong adoption, measurable outcomes, and multiple technical owners. • You are trusted across Engineering to lead difficult developer-workflow and delivery decisions. Why Join Us You'll shape the engineering system behind a rapidly evolving cybersecurity product used by organizations around the world. Your work will improve how every engineering team builds and operates NodeZero while establishing a new, high-leverage technical function at Horizon3. Travel Occasional travel may be required for company onsite meetings and team collaboration. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice. Application Note In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Develop and maintain backend APIs and ETL pipelines for security controls integration platform. | 7+ years software engineering experience with modern languages, cloud platforms, SQL, and backend API development. | Role Overview: The Senior Backend Engineer will join our world-class software engineering team as a key contributor to both user-facing product launches and platform enhancements and stability. You will own our security controls integration platform, abstracting the complexity of the EDR ecosystem from the rest of our system. Core responsibilities include developing per-vendor normalizers, building live API pipelines, defining internal schemas, and managing versioning, deprecations, fault tolerance, and integration health monitoring. You'll also collaborate with the broader backend engineering team on cross-cutting scale and reliability work. What You'll Do Responsibilities • Design and build dedicated normalizers per EDR vendor, with the testing rigor to keep them trustworthy as vendor APIs evolve • Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval. • Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product. • Build and maintain ETL pipelines for efficient data processing and analytics. • Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience. What You'll Bring • Deep experience building and maintaining third-party API integrations at scale • Hands-on familiarity with EDR platforms and an understanding of how SOC teams consume EDR data • Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment • Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work • Strong technical documentation ability to support the development process. • Effective communication and collaboration with designers, developers, and product managers. • Ability and interest in mentoring junior and mid-level engineers to foster their growth and development. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. Preferred Education/Experience • Experience with various database architectures including relational (PostgreSQL) and graph (Neo4j). • Experience building GraphQL backends. • Experience managing and maintaining production infrastructure. • Experience building platform capabilities for internal teams. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,250 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Develop and maintain backend security controls integration platform including API normalizers, ETL pipelines, and collaboration with frontend and backend teams. | 7+ years software engineering experience with modern languages, cloud platforms, SQL expertise, and strong documentation and collaboration skills. | Role Overview: The Senior Backend Engineer will join our world-class software engineering team as a key contributor to both user-facing product launches and platform enhancements and stability. You will own our security controls integration platform, abstracting the complexity of the EDR ecosystem from the rest of our system. Core responsibilities include developing per-vendor normalizers, building live API pipelines, defining internal schemas, and managing versioning, deprecations, fault tolerance, and integration health monitoring. You'll also collaborate with the broader backend engineering team on cross-cutting scale and reliability work. What You'll Do Responsibilities • Design and build dedicated normalizers per EDR vendor, with the testing rigor to keep them trustworthy as vendor APIs evolve • Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval. • Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product. • Build and maintain ETL pipelines for efficient data processing and analytics. • Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience. What You'll Bring • Deep experience building and maintaining third-party API integrations at scale • Hands-on familiarity with EDR platforms and an understanding of how SOC teams consume EDR data • Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment • Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work • Strong technical documentation ability to support the development process. • Effective communication and collaboration with designers, developers, and product managers. • Ability and interest in mentoring junior and mid-level engineers to foster their growth and development. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. Preferred Education/Experience • Experience with various database architectures including relational (PostgreSQL) and graph (Neo4j). • Experience building GraphQL backends. • Experience managing and maintaining production infrastructure. • Experience building platform capabilities for internal teams. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,250 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Develop and maintain backend security controls integration platform including vendor normalizers, ETL pipelines, and GraphQL APIs. | 7+ years professional software engineering experience with modern languages, cloud platforms, SQL expertise, and strong documentation and collaboration skills. | Role Overview: The Senior Backend Engineer will join our world-class software engineering team as a key contributor to both user-facing product launches and platform enhancements and stability. You will own our security controls integration platform, abstracting the complexity of the EDR ecosystem from the rest of our system. Core responsibilities include developing per-vendor normalizers, building live API pipelines, defining internal schemas, and managing versioning, deprecations, fault tolerance, and integration health monitoring. You'll also collaborate with the broader backend engineering team on cross-cutting scale and reliability work. What You'll Do Responsibilities • Design and build dedicated normalizers per EDR vendor, with the testing rigor to keep them trustworthy as vendor APIs evolve • Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval. • Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product. • Build and maintain ETL pipelines for efficient data processing and analytics. • Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience. What You'll Bring • Deep experience building and maintaining third-party API integrations at scale • Hands-on familiarity with EDR platforms and an understanding of how SOC teams consume EDR data • Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment • Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work • Strong technical documentation ability to support the development process. • Effective communication and collaboration with designers, developers, and product managers. • Ability and interest in mentoring junior and mid-level engineers to foster their growth and development. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. Preferred Education/Experience • Experience with various database architectures including relational (PostgreSQL) and graph (Neo4j). • Experience building GraphQL backends. • Experience managing and maintaining production infrastructure. • Experience building platform capabilities for internal teams. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,250 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Develop and maintain backend security controls integration platform including vendor normalizers, ETL pipelines, and GraphQL APIs. | Senior-level backend engineering with 7+ years experience, expertise in API integrations, cloud platforms, SQL, and strong communication and mentoring skills. | Role Overview: The Senior Backend Engineer will join our world-class software engineering team as a key contributor to both user-facing product launches and platform enhancements and stability. You will own our security controls integration platform, abstracting the complexity of the EDR ecosystem from the rest of our system. Core responsibilities include developing per-vendor normalizers, building live API pipelines, defining internal schemas, and managing versioning, deprecations, fault tolerance, and integration health monitoring. You'll also collaborate with the broader backend engineering team on cross-cutting scale and reliability work. What You'll Do Responsibilities • Design and build dedicated normalizers per EDR vendor, with the testing rigor to keep them trustworthy as vendor APIs evolve • Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval. • Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product. • Build and maintain ETL pipelines for efficient data processing and analytics. • Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience. What You'll Bring • Deep experience building and maintaining third-party API integrations at scale • Hands-on familiarity with EDR platforms and an understanding of how SOC teams consume EDR data • Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment • Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work • Strong technical documentation ability to support the development process. • Effective communication and collaboration with designers, developers, and product managers. • Ability and interest in mentoring junior and mid-level engineers to foster their growth and development. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. Preferred Education/Experience • Experience with various database architectures including relational (PostgreSQL) and graph (Neo4j). • Experience building GraphQL backends. • Experience managing and maintaining production infrastructure. • Experience building platform capabilities for internal teams. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,250 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Develop and maintain backend security controls integration platform including vendor normalizers, ETL pipelines, and GraphQL APIs. | 7+ years software engineering experience with modern languages, cloud platforms, SQL expertise, and strong documentation and collaboration skills. | Role Overview: The Senior Backend Engineer will join our world-class software engineering team as a key contributor to both user-facing product launches and platform enhancements and stability. You will own our security controls integration platform, abstracting the complexity of the EDR ecosystem from the rest of our system. Core responsibilities include developing per-vendor normalizers, building live API pipelines, defining internal schemas, and managing versioning, deprecations, fault tolerance, and integration health monitoring. You'll also collaborate with the broader backend engineering team on cross-cutting scale and reliability work. What You'll Do Responsibilities • Design and build dedicated normalizers per EDR vendor, with the testing rigor to keep them trustworthy as vendor APIs evolve • Develop core product features in ETL (Extract, Transform, Load) and GraphQL to support data processing and retrieval. • Design and implement backend APIs in GraphQL to facilitate data interactions between different components of the product. • Build and maintain ETL pipelines for efficient data processing and analytics. • Collaborate with frontend team members to present data in a clear and user-friendly format, enhancing the product's user experience. What You'll Bring • Deep experience building and maintaining third-party API integrations at scale • Hands-on familiarity with EDR platforms and an understanding of how SOC teams consume EDR data • Driven, self-managed, capable of conceiving and implementing solutions on your own and with a team • A strong desire to continuously improve and learn new technologies in a fast-paced Agile development environment • Excellent analytical and problem-solving skills, effective communication, attention to detail and high-quality work • Strong technical documentation ability to support the development process. • Effective communication and collaboration with designers, developers, and product managers. • Ability and interest in mentoring junior and mid-level engineers to foster their growth and development. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. Preferred Education/Experience • Experience with various database architectures including relational (PostgreSQL) and graph (Neo4j). • Experience building GraphQL backends. • Experience managing and maintaining production infrastructure. • Experience building platform capabilities for internal teams. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,750 - $270,250 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work on defensive agents, including architecture, coding, mentorship, and product collaboration. | Requires 7+ years software engineering with modern languages, cloud and container experience, distributed systems, and production service ownership. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work on defensive agents for autonomous remediation in a cybersecurity platform. | Requires 7+ years software engineering experience with modern backend languages, cloud platforms, distributed systems, and production service operation. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work for defensive agent systems including architecture, coding, and mentorship. | 7+ years software engineering with modern languages, cloud platform experience, distributed systems, and production service ownership. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work for defensive agent systems including architecture, code, design review, and mentorship. | 7+ years software engineering experience, expertise in modern backend languages, cloud platforms, distributed systems, and agentic or LLM-backed systems. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work and architecture for defensive agent systems, write production code, mentor engineers, and collaborate with AI researchers and product teams. | 7+ years software engineering experience, expertise in modern backend languages, cloud platforms, distributed systems, and production service operation. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Lead technical work for defensive agent systems including architecture, coding, design review, and mentorship in a cybersecurity platform. | 7+ years software engineering with modern languages, cloud platform experience, deep knowledge of agentic/LLM systems, SQL expertise, and distributed systems operation. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do We are hiring a Staff Software Engineer to lead the technical work for NodeZero's defensive agents: the systems that translate proven attack paths into continuous actionable remediation. You'll set direction alongside our AI researchers, who define what the agents should reason about, and lead the engineers who build the platform underneath them. Over time this role owns the technical strategy for how autonomous remediation becomes a core NodeZero product capability rather than a set of recommendations in a report. This is a technical leadership role without direct people management. You lead through architecture, code, design review, and mentorship, not through performance reviews and headcount. It is also not a pure architect role. You will write production code every week, review PRs from the engineers you lead, and partner closely with Product to sequence the right problems in the right order. You will be the person who both draws the system diagram on the whiteboard and commits the first slice of it to main. Responsibilities Leadership & Team Development • Owns the end-to-end technical vision for the workstream and rallies the team around it - from blank doc through shipping, iterating, and deprecating. • Production code contributions at Lead/Staff level in a modern backend language (Python, Go, Rust, or similar) in a service-oriented environment. • Sets and raises the technical bar (design reviews, code quality, operational discipline) by example rather than by mandate. • Mentors and enhances the engineers around them; builds the frameworks and architecture for others to do the best work of their careers. • Holds the team accountable to outcomes rather than activity; surfaces risks and tradeoffs early and in writing. • Serves as the durable technical interface between AI research and platform engineering, so research direction accounts for platform constraints early rather than at handoff. Product-Minded Technical Leadership • Translates ambiguous product goals into concrete technical roadmaps. • Makes build vs. buy vs. integrate calls with business context, not just engineering preference - including which model providers, orchestration frameworks, and control-plane integrations we own versus adopt. • Partners closely with PM - comfortable in PRD reviews, not just sprint planning. • Sequences an MVP without painting the team into a corner. Agentic Systems & Platform Expertise • Designs durable execution for long-running, resumable agent runs. • Designs the tool and authorization layer so tenant scope and permissions are enforced by the systems the agent calls. • Owns multi-tenant isolation for agents that take write actions. • Architects the connector framework over heterogeneous third-party security control APIs. • Treats untrusted environment data as an attack surface; understands prompt injection and keeps model output out of the path that authorizes privileged action. • Builds observability that makes agent behavior explainable.. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Deep experience with agentic or LLM-backed systems in production with a clear-eyed view of where they fail and how to contain it. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $229,000-$270,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.

Build and maintain a secure, scalable backend platform for defensive agents with strong focus on distributed systems, observability, and multi-tenant isolation. | 7+ years software engineering experience with backend and distributed systems, cloud platform expertise, SQL proficiency, and production service ownership. | Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox" security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. What You'll Do As a Senior Backend Engineer on the Defensive Agent team, you'll build the platform that NodeZero's defensive agents run on. Our AI researchers define what these agents should reason about, you build the systems that make that work in production, across thousands of customer tenants, without breaking anything. That means real distributed systems problems, not glue code. They execute inside customer environments under tight isolation, credential, and egress constraints. And when an agent proposes a change in production, the platform has to be able to simulate it, stage it, gate it on approval, roll it back, and prove after the fact exactly what happened and on whose authority. This is a platform role. You'll own the runtime, the tool layer, the orchestration, the connector framework, and the observability that makes agent behavior debuggable. You'll work closely with our AI researchers, but you are not being hired to tune prompts - you are being hired to build the substrate that makes their work shippable and safe. Responsibilities • Build and own the agent execution runtime: durable, resumable, long-running workflows with checkpointing, idempotent steps, cancellation, and timeouts at both the step and run level. • Design and implement the tool layer that agents act through - a registry with versioning, schema validation, per-tenant enablement, and authorization enforced server-side rather than by the model. • Build the connector framework for third-party security control planes (EDR, firewall, identity, SIEM, cloud IAM). • Implement the safe-change pipeline: dry-run and simulation, blast-radius classification, approval gates for high-impact actions, staged rollout, rollback, and an immutable per-tenant audit trail. • Extend NodeZero's tenant isolation model to agents that take write actions, covering execution boundaries, egress control, quotas, and cross-tenant leakage in caches, indexes, and logs. • Develop core product features in ETL and GraphQL to support data processing and retrieval for agent context, run history, and remediation state. • Build the ETL pipelines that turn pentest and remediation outcomes into the datasets our researchers train and evaluate against. • Instrument everything. Distributed tracing across an agent run, cost and token accounting per tenant, and the tooling to answer "why did the agent do that" without guessing. • Partner with AI researchers, attack engineers, and product to take capabilities from prototype to production, and feed platform constraints back into research direction early rather than late. Required Education / Experience • Bachelor's Degree in Computer Science, Computer Engineering or related field. • 7+ yrs professional software engineering experience using modern object-oriented or functional languages (Python, Go, Scala, C++, TypeScript, etc). • Experience building applications on cloud computing platforms such as AWS, Azure, GCP, using container technologies such as Docker and Kubernetes. • Expert proficiency in SQL. • Demonstrated experience designing and operating distributed systems in production: asynchronous workflows, queues, retries, idempotency, and partial failure. • A track record of shipping and operating production services, including on-call ownership. What Sets You Apart • Experience building agentic or LLM-backed systems in production • Experience with a durable execution (such as Temporal) or workflow engine or having built equivalent checkpointing yourself. • Experience building multi-tenant platforms with hard isolation requirements, workload identity, and short-lived credential brokering. • Experience integrating a long tail of third-party APIs behind a normalized abstraction. • Familiarity with security control planes and their APIs - EDR (CrowdStrike, SentinelOne, Microsoft Defender), firewalls, SIEM, cloud IAM. • Experience with database architectures including relational (PostgreSQL) and graph (Neo4j), and experience building GraphQL backends. • Experience with observability tooling (Datadog, Prometheus, Grafana) and distributed tracing. • Awareness of prompt injection and untrusted-input handling in systems where an agent consumes data from the environment it operates in. Perks of Horizon3 • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities. • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking. • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. Compensation and Values At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. In accordance with various State's transparency regulations, we provide the following salary range information for this position: • Base salary range: $199,000 - $235,000 annually. The exact salary will be determined based on the selected candidate's location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. You Belong Here Horizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, or any other legally protected status by law. Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth. We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.