ProNexus

Design, build, and deploy full stack AI product features including Python services, React workflows, and LLM integration. | 1-9 years experience with Python, TypeScript, React, and ability to ship product features in a fast-paced startup. | We are hiring on behalf of a venture-backed AI startup building intelligent software that automates business workflows. The company combines large language models, proprietary data, and human-in-the-loop systems to help customers complete high-value work faster and more accurately. Its engineering team is small, product-oriented, and responsible for taking ideas from early customer conversations through production. About the role As a Fullstack Software Engineer, you will own meaningful parts of the product from design through deployment. You might build a new React workflow one week, develop a Python service the next, and then work directly with customers to improve how an AI agent performs in production. This role is best suited to an engineer who enjoys moving across the stack, making product decisions, and shipping quickly in an early-stage environment. What you’ll do Build and launch customer-facing AI product features Develop modern web applications using React and TypeScript Build backend services and APIs using Python and TypeScript Design relational data models using PostgreSQL Integrate large language models, third-party APIs, and customer data sources Deploy and operate production services using AWS Improve application performance, reliability, observability, and security Work closely with founders, product leaders, designers, and customers Own projects from initial problem definition through production Help establish engineering standards as the team grows What we’re looking for Approximately 1–9 years of professional software engineering experience Strong production experience with Python, TypeScript, or both Experience building web applications with React or NextJS Experience developing APIs, backend services, and database-backed applications Familiarity with PostgreSQL or another relational database A track record of independently shipping meaningful product features Strong product judgment and attention to user experience Comfort working across multiple layers of a technical system Ability to operate effectively in a fast-moving and sometimes ambiguous environment Clear written and verbal communication Equivalent experience matters more than a specific number of years. Nice to have Experience building AI, LLM, agent, or machine-learning products Experience with AWS, GCP, Docker, Kubernetes, or Terraform Familiarity with LLM evaluations, retrieval, prompting, or observability Previous experience at an early-stage or venture-backed startup Experience owning a product or technical area with limited supervision Why join Build production AI products used by real customers Work on problems that span product, engineering, data, and AI Have significant ownership over what gets built and how Work directly with company leadership and customers Join an early team where individual contributions have visible impact Receive a competitive salary and meaningful equity

Design and build backend services, APIs, and scalable data models using Python and PostgreSQL, managing asynchronous workflows and AWS infrastructure. | 2-9 years software engineering experience with strong Python and relational database skills, capable of independent project ownership and production operations. | We are hiring on behalf of a venture-backed AI startup building intelligent software that automates complex business workflows. The platform uses large language models, proprietary data, and human-in-the-loop systems to complete work that previously required significant manual effort. Its backend systems power AI agents, customer integrations, data processing, evaluation infrastructure, and production workflows. The company is hiring a Backend Engineer to build the reliable systems behind its AI products. About the role As a Backend Engineer, you will design and build the services, APIs, data models, and infrastructure that power the company’s product. You will work primarily in Python and PostgreSQL while collaborating closely with product engineers, AI engineers, customers, and company leadership. This is not a narrow API-development role. You will work on production architecture, data systems, model integrations, security, reliability, and product capabilities. What you’ll do Design, build, and maintain production backend services using Python Develop APIs that support customer-facing applications and AI workflows Design scalable relational data models using PostgreSQL Build integrations with model providers, customer systems, and third-party platforms Develop systems for asynchronous jobs, event processing, and long-running AI workflows Deploy and operate services using AWS Debug production issues across application, data, model, and infrastructure layers Help shape backend architecture and engineering practices as the company grows What we’re looking for Approximately 2–9 years of professional software engineering experience Strong professional experience with Python Experience designing and operating production APIs or backend services Strong understanding of relational databases, SQL, and data modeling Experience with PostgreSQL or a comparable production database Familiarity with AWS, GCP, or another major cloud platform Understanding of application security, authentication, and authorization Experience debugging and operating systems in production Ability to independently own technical projects from design through deployment Comfort making pragmatic engineering decisions in an early-stage environment Strong communication and cross-functional collaboration skills Nice to have (not required) Experience building AI, LLM, agent, or machine-learning infrastructure Experience integrating OpenAI, Anthropic, or other model providers Familiarity with LLM evaluation, retrieval, embeddings, or vector databases Experience with Docker, Kubernetes, Terraform, or CI/CD systems Experience with Redis, Kafka, queues, or event-driven architectures Experience building multi-tenant SaaS products Previous experience at an early-stage startup Experience with data-intensive or distributed systems

Design and build end-to-end product features connecting backend and frontend, owning the full feature lifecycle. | 3+ years full-stack engineering with Python, React, PostgreSQL, strong product mindset, and startup experience. | We're looking for a Senior Full-Stack Engineer with 3+ years of experience to join our client's Care Journey team — the team that owns the core experience members have when they first engage with care on the platform. This is a product-minded IC role for someone who leans backend-heavy but can work confidently across the stack. You'll own features end-to-end in a startup environment, partnering closely with product and design to ship meaningful user outcomes. Responsibilities Design, build, and iterate on end-to-end product features powering the Care Journey experience, connecting backend systems with frontend interfaces Own features from technical design through implementation, rollout, and continuous iteration Develop and maintain backend services and APIs (REST and GraphQL) for user-facing applications and service-to-service interactions Build and refine frontend components in React with a focus on usability, performance, and user experience Model and manage application data in PostgreSQL — clean, well-structured data design Work closely with PMs and designers to translate business needs into high-quality, user-centric solutions Contribute to technical design discussions; shape pragmatic solutions aligned with product goals Mentor engineers and help foster a strong product mindset across the team Tech Stack Python, React, PostgreSQL, AWS, GraphQL What we're looking for - 3+ years of full-stack engineering experience shipping production web applications - Experience building and shipping user-facing products end-to-end - Strong backend/API experience, including REST and GraphQL - Strong proficiency in Python, React, and PostgreSQL - Experience in a VC-backed startup or growth-stage environment preferred - Healthcare, mental health, or benefits platform experience is a plus - Strong product mindset and ability to collaborate closely with product and design - Strong communication with both technical and non-technical stakeholders - Remote within the US, excluding Hawaii

Design and build end-to-end product features connecting backend and frontend, owning full lifecycle from design to rollout and iteration. | 3+ years full-stack engineering with Python, React, PostgreSQL; experience in startups and product collaboration preferred. | We're looking for a Senior Full-Stack Engineer with 3+ years of experience to join our client's Care Journey team — the team that owns the core experience members have when they first engage with care on the platform. This is a product-minded IC role for someone who leans backend-heavy but can work confidently across the stack. You'll own features end-to-end in a startup environment, partnering closely with product and design to ship meaningful user outcomes. Responsibilities Design, build, and iterate on end-to-end product features powering the Care Journey experience, connecting backend systems with frontend interfaces Own features from technical design through implementation, rollout, and continuous iteration Develop and maintain backend services and APIs (REST and GraphQL) for user-facing applications and service-to-service interactions Build and refine frontend components in React with a focus on usability, performance, and user experience Model and manage application data in PostgreSQL — clean, well-structured data design Work closely with PMs and designers to translate business needs into high-quality, user-centric solutions Contribute to technical design discussions; shape pragmatic solutions aligned with product goals Mentor engineers and help foster a strong product mindset across the team Tech Stack Python, React, PostgreSQL, AWS, GraphQL What we're looking for - 3+ years of full-stack engineering experience shipping production web applications - Experience building and shipping user-facing products end-to-end - Strong backend/API experience, including REST and GraphQL - Strong proficiency in Python, React, and PostgreSQL - Experience in a VC-backed startup or growth-stage environment preferred - Healthcare, mental health, or benefits platform experience is a plus - Strong product mindset and ability to collaborate closely with product and design - Strong communication with both technical and non-technical stakeholders - Remote within the US, excluding Hawaii