Senior Full-Stack Engineer at Marvin, a mental health platform sold to employers and health plans, owns features across a Next.js/React/TypeScript app, Prisma/Postgres backend, and AWS infrastructure. The role extends an LLM-powered AI coach with retrieval, structured extraction, and agentic tool use, and builds evals and observability for AI features. The work involves handling protected health information (PHI) and maintaining agentic coding practices.
Senior Software Engineer (Full-Stack, AI-Native)
Marvin · Denver/Los Angeles - Hybrid 2-day in office · Full-time · $160k-190k
Marvin helps people navigate their mental health and wellbeing. We partner with employers and health plans to give their members one place to understand their coverage, find care, and get support, including an AI coach built into the product. We're a small team shipping a production healthcare application, which means every engineer touches things that matter and owns them end to end.
We're hiring a senior full-stack engineer who has made AI a core part of how they build software, not a novelty. This is not a machine learning research role. You won't train models or tune GPUs. You will ship product in a modern TypeScript/Next.js stack, and you'll do it with AI woven into both the product and your own workflow.
Two things distinguish this role from a standard senior web position:
Core engineering
AI fluency (the part that sets you apart)
Nice to have
AI is part of our engineering culture, not a side experiment. Our repository ships with agent configuration, we maintain shared skills for code review and security checks, and we expect engineers to spend more of their time on judgment and less on typing. We also expect the opposite discipline: no unreviewed AI-generated code lands, and "the agent wrote it" is never an explanation for a bug.
160-190k base salary · Equity · Health, dental, and vision · [401(k)] · Unlimited PTO · Hybrid 2 days/wk in office (LA or Denver)
Marvin is an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
Compensation: $160K - $190K
