Mozilla

You would build and improve WebCompat dashboards and screenshot-capture tooling, partnering with the team and QA to support site-breakage triage and reporting. | The role requires JavaScript, HTML, CSS, Python and Django, dashboard or data-view experience, tooling and automation familiarity, self-direction, and clear written communication; WebCompat, Bugzilla, screenshot pipelines, and machine learning are preferred. | The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven. • This role will be Remote and must be located in Eastern Time Zone in US or Canada Responsibilities • Build and improve WebCompat dashboards (triage, reporting, and metrics). • Improve the broken-site-report screenshot capture and pipeline. • Work with the WebCompat team (including QA) to turn reporting and triage needs into reliable tooling. Required Qualifications • Solid web development (JavaScript, HTML, CSS, Python & Django) and experience building dashboards / data views. • Comfort with tooling, automation, and web services. • Self-directed, with good written communication. Preferred • Familiarity with WebCompat workflows and Bugzilla. • Experience with screenshot / automation pipelines. • Experience with Machine Learning

Build and improve Mozilla’s internal developer platform, covering CI/CD, observability, Kubernetes, environment setup, cost optimization, and cross-team technical leadership. | Requires 5+ years in platform engineering, cloud engineering, SRE, or DevOps; technical leadership; proficiency in Python, JavaScript, or Go; and experience with cloud-native infrastructure tools. | Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this role: Mozilla’s Cloud Engineering team seeks a Senior Software Engineer to mature, maintain, and build features for our Internal Developer Infrastructure Platform. You will work on creating standardized, scalable systems for CI/CD, Observability, Kubernetes optimization, environment bootstrapping, cost optimization, and more. Supporting the Infrastructure needs of the organization and identifying new opportunities to mature the path to production in a safe, cost effective way will also be an integral part of this role. What you’ll do: Support infrastructure that development teams use to own and operate their services at Mozilla. Guide technical decision-making and adoption of user-centric solutions. Create Claude skills and design agentic workflows that improve developer productivity Guide team members and promote engineering standard methodologies, with a focus on usability and maintainability. Facilitate cross-functional collaboration for efficient and cohesive platform delivery. Write proposals and decision briefs for new policies, processes, and platform functionality. Create new features for the platform with a meaningful value proposition Be trusted to resolve unclear but urgent tasks. What you’ll bring: 5+ years experience in software engineering with expertise in at least one of (Platform Engineering, Cloud Engineering, SRE, DevOps) Proven technical leadership experience. Expertise in several of the following (ArgoCD, Grafana, K8s, GitHub, Terraform, Helm, Backstage, Cloud Cost Optimization) Proficient in Python, JavaScript, or Go. Strong expertise in cloud-native technologies (GCP preferred; AWS also acceptable). Excellent communication skills aligning technology with user needs and organizational goals. Self-starter who thrives in ambiguity. Curiosity and interest in learning new things Commitment to our values: Welcoming differences Being relationship-minded Practicing responsible participation Having grit Bonus points for… Experience with distributed systems architecture and design Knowledge of cloud security and governance principles Experience designing agentic workflows Database expertise Experience building Internal Developer Platforms What you’ll get: Generous performance-based bonus plans to all regular employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3164 Hiring Ranges: US Tier 1 Locations $137,000—$183,000 USD US Tier 2 Locations $126,000—$168,000 USD US Tier 3 Locations $116,000—$155,000 USD

Maintain the ISMS and lead ISO 27001 and SOC 2 compliance programs, including policy development, audits, control ownership, and remediation. | Requires at least five years in information security, GRC, or compliance, with deep familiarity with ISO 27001 and SOC 2 and strong cross-functional communication skills. | Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we're shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we're doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren't beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: This role is part of the Governance, Risk & Compliance (GRC) function within Mozilla's Security team. The Security team supports Product, Enterprise, and GRC functions across the organization, aligned with the mission to build a safe and secure internet. This role is responsible for maintaining and advancing Mozilla's Information Security Management System (ISMS) and supporting our ISO 27001 and SOC 2 Type 2 compliance programs — from policy and control design through audit readiness and certification. The ideal candidate has hands-on experience across the full breadth of a compliance program, is comfortable building process where none yet exists, and works well with a wide range of cross-functional stakeholders. What you'll do: Maintain and mature the ISMS, including the Statement of Applicability (SoA), risk treatment plans, and the Management Review Meeting (MRM) process and cadence. Support ISO 27001 and SOC 2 Type 2 audit execution—helping determine scope, preparing evidence and narrative artifacts, participating in auditor interviews and walkthroughs, and resolving auditor findings. Contribute to the SOC 2 System Description and other audit-specific narrative documentation, ensuring they accurately reflect the organization's actual control environment. Track gaps and remediation efforts arising from readiness assessments and audits. Lead the policy program—driving policy creation, revision, and cross-functional review cycles to keep the security policy set current, enforceable, and audit-ready. Support compliance scaling as additional products or business units pursue readiness assessments and certification. Support the internal audit function, partnering with internal or third-party resources as needed to meet ISO 27001's internal audit requirements. Partner closely with Engineering, IT, Legal, Privacy, People teams, and product leadership to gather evidence, drive control ownership, and translate compliance requirements into practical, adoptable practices. Advise the GRC manager and broader Security leadership on audit risk, certification readiness, and compliance program strategy. What you'll bring: 5 years of experience in information security, GRC, or compliance-focused roles. Deep familiarity with ISO 27001 and SOC 2 Trust Services Criteria, gained through meaningful involvement in audits from readiness through certification. Comfort operating across the full breadth of an ISMS—SoA maintenance, Management Review Meetings, and System Description authorship. Demonstrated experience writing and revising security policies, including running cross-functional review cycles to gain organization-wide buy-in and adoption. Experience tracking gaps and remediation plans and connecting that work to an organization's broader compliance and risk program. Excellent cross-functional collaboration skills—comfortable working with engineers, product managers, legal, and executive stakeholders, and able to translate compliance requirements into practical, actionable workflows. Ability to ramp up quickly and operate with a high degree of independence. Comfort building processes where none yet exist. Strong written and verbal communication skills; ability to represent Mozilla credibly and confidently in front of external auditors. Relevant industry certifications (e.g., CISA, CISSP, ISO 27001 Lead Auditor/Implementer) are a plus. Commitment to our values: Welcoming differences Being relationship-minded Practicing responsible participation Having grit What you'll get: Generous performance-based bonus plans to all eligible employees—we share in our success as one team. Rich medical, dental, and vision coverage. Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute). Quarterly all-company wellness days where everyone takes a pause together. Country-specific holidays plus a day off for your birthday. One-time home office stipend. Annual professional development budget. Quarterly well-being stipend. Considerable paid parental leave. Employee referral bonus program. Other benefits (life/AD&D, disability, EAP, etc.—varies by country). About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: C #LI-REMOTE Req ID: R3197 Hiring Ranges: US Tier 1 Locations $163,000—$218,000 USD US Tier 2 Locations $150,000—$200,000 USD US Tier 3 Locations $139,000—$185,000 USD

Design and prototype browser-engine subsystem changes to improve performance and correctness and enable programmatic interaction with web content. | Requires 10+ years of experience, deep hands-on browser-engine expertise, and strong C++ or Rust proficiency. | Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role Mozilla is seeking experienced browser engineers to join a small team exploring new applications of browser technology. The work combines deep systems engineering, rapid experimentation, and close collaboration across technical disciplines. We are looking for a browser engine specialist who enjoys turning difficult systems questions into working experiments. You will investigate browser behavior, implement changes deep in the engine, and establish which ideas produce meaningful improvements. This is a hands-on individual contributor role with ownership of engine-level investigations and implementation, working closely with the team’s technical lead. The work suits someone who has built or substantially changed browser internals, understands the tradeoffs embedded in those systems, and enjoys applying that knowledge to unfamiliar problems. Your experiments will help inform technical direction. What you'll do: Design and implement experiments within browser engine subsystems. Investigate how internal data structures and execution behavior affect performance, correctness, and the interfaces exposed to developer tools. Evaluate ways to represent and expose browser state efficiently and accurately. Identify the tradeoffs in each approach, including information loss, implementation complexity, and compatibility with dynamic web content. Prototype engine capabilities that support reliable programmatic interaction with web content. Investigate how document structure, layout, navigation, and event handling affect correctness and performance. Instrument browser behavior and evaluate changes against repeatable tasks. Measure performance and correctness, isolate the effect of each change, and document unsuccessful experiments as clearly as successful ones. Check that gains hold beyond the workloads used to develop the prototype. Profile the overhead introduced by new capabilities and pursue improvements where measurements justify them. Use AI tools to accelerate coding and analysis, and verify their output through debugging, tests, and measurement. What you'll bring: Deep hands-on expertise in at least one browser engine subsystem, such as DOM and Web APIs, layout and rendering, accessibility, JavaScript runtimes, or networking and process architecture. You have implemented substantial changes and can trace their effects into neighboring subsystems. Strong proficiency in C++ or Rust, experience navigating a large systems codebase, and practical knowledge of memory ownership, concurrency, object lifetimes, and performance debugging. You can build the JavaScript and scripting tools needed to exercise and measure your work. A demonstrated ability to investigate unfamiliar code, form a precise hypothesis, construct a useful prototype, and interpret the results. You can separate the effects of your implementation from variability in websites, workloads, or model behavior. A strong understanding of web platform behavior and compatibility. You can reason about how document structure, script execution, rendering, and user interaction relate, including cases where the browser’s internal state is difficult to expose accurately to another system. Experience with profiling, tracing, regression tests, or conformance tests, and a habit of grounding performance claims in reproducible evidence. You can explain both the benefit of an optimization and the circumstances in which it fails. Curiosity about AI agents and a willingness to work directly with agent harnesses and coding tools. You can connect a low-level implementation choice to the information an agent receives and the work it must do next. Nice to have: Contributions to Gecko, Servo, Blink, WebKit, or another browser engine Experience maintaining an open-source project Technical leadership in a small team building a new product Experience with accessibility infrastructure, browser security, profiling, or automated evaluation of agent workflows What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: C #LI-REMOTE Req ID: R3221 Hiring Ranges: US Tier 1 Locations $195,000—$260,000 USD US Tier 2 Locations $179,000—$239,000 USD US Tier 3 Locations $166,000—$221,000 USD

Lead backend development and own end-to-end service lifecycle including deployment, operation, and maintenance. | 4+ years backend development experience with Python, TypeScript, or Rust, proficiency in PostgreSQL, cloud infrastructure, and production operations ownership mindset. | Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this role: As a Senior Software Engineer on the Ecosystem Services Team, you’ll build and own back-end systems and the integrations that keep our services running, help maintain and evolve the cloud infrastructure the application runs on, and play an active role in keeping the service reliable and healthy in production. You'll do this while collaborating closely with frontend engineers, product managers, CloudEng, and UX and design partners to deliver reliable features. We are looking for engineers who treat the systems they build as their own: people who are comfortable owning a service end to end, from writing the code to verifying it works as intended in production and monitoring its health. We are hiring for multiple Ecosystem Services Team back-end teams - each solving their own unique challenges to make the web better for everyone. More details about all hiring teams will be shared in the interviews. About Ecosystem Services: Ecosystem Services builds and operates the back-end platforms that power Mozilla products and services, with a focus on privacy, security, and delivering critical functionality to Firefox and millions of users worldwide. Our portfolio spans a diverse set of platforms and services. Representative examples include Privacy Services, which provides the APIs and infrastructure behind Mozilla VPN, Relay (email and phone aliasing), and Monitor (data breach detection and remediation); AutoPush, Mozilla's Web Push platform for securely delivering notifications and real-time updates to Firefox clients; and Remote Settings, Mozilla's platform for delivering configuration updates to Firefox outside the regular release cycle. Together with many other backend platforms across the organization, these services help deliver secure, reliable experiences to Mozilla users every day. Our teams own services end-to-end from designing and building distributed systems, to operating them in production, improving reliability, and evolving the cloud infrastructure they run on. We work closely with product, frontend engineering, Cloud Engineering, UX, and design partners to build resilient systems that make the web better for everyone. We're hiring backend engineers across multiple Ecosystem Services teams, each tackling different technical challenges while sharing a culture of ownership, collaboration, and operational excellence. More details about the specific teams and domains will be shared during the interview process. What you’ll do: Lead backend development, building and maintaining server-side logic Take real ownership of the services you work on: deploy them, operate them, and keep them healthy in production rather than handing them off Work closely with our CloudEng Team to maintain and improve production environments, including monitoring and alerting with tools such as OpenTelemetry, Sentry, Prometheus, and Grafana Participate in an on-call / off-hours support rotation, triaging and resolving production issues, partnering with CloudEng and support teams to investigate incidents, address bug reports, and keep the application running reliably Periodically rotate into a support role, handling releases, dependency updates, and incoming work requests from customer support and other stakeholders Thoughtfully apply AI-assisted development tools to move faster and raise quality, while maintaining good judgment about where they fit and where they don't Partner with and support stakeholders (e.g. front-end, platform), ensuring backend systems, APIs, and data contracts meet their needs Partner with frontend and cross-functional teams to align on project goals, contribute to API design, and ensure backend systems, APIs, and data contracts meet their needs Participate in code reviews to maintain high standards of code quality and system reliability Participate in security and privacy reviews, ensuring all data protection measures meet compliance standards What you’ll bring: 4+ years of experience in software development with a strong focus on backend technologies Strong professional experience with Python , TypeScript/Node.js, or Rust building back-end services and confidence leading back-end engineering projects. Proficiency with PostgreSQL and SQL query optimization, including relational schema design and migrations with a query builder such as Knex Hands-on DevOps experience on Google Cloud Platform (GCP), with Docker-based build and deploy pipelines. You are comfortable deploying, operating, and troubleshooting services in the cloud rather than handing that responsibility to someone else Hands-on experience with observability and monitoring tooling such as Sentry and Grafana A pragmatic commitment to shipping quality work. You care about the quality and reliability of what you ship, you make sensible trade-offs under real constraints, and you consistently move work to and into production. Strong engineering judgment. You can navigate ambiguity, weigh trade-offs, and make sound decisions with incomplete information, and you know when to ask for input A genuine ownership mindset. You are excited to own a service end to end and have a track record of operating what you build in production, including experience with on-call or off-hours production support Experience mentoring junior engineers and driving technical excellence in code quality, testing, and process improvements Bonus Points for experience with: Performance / load testing Experience with IaC tools such as Terraform and Kubernetes Open-source contributions or personal engineering projects Django experience What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3234 Hiring Ranges: US Tier 1 Locations $137,000—$183,000 USD US Tier 2 Locations $126,000—$168,000 USD US Tier 3 Locations $116,000—$155,000 USD