Founding Engineer
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Job Description
Founding Engineer building AI agents and full-stack features for 3Y Health’s healthcare practice operating system. Owning products from ambiguous problem definition through production deployment.
Responsibilities:
- Design and build AI agents and automated workflows for clinic operations, including insurance benefits verification, prior authorizations, patient intake, claims, and clinical documentation
- Build web and mobile features for clinicians, patients, families, and the internal operations team
- Take ambiguous problems from 0 to 1 with operators and clinicians, define the problem, write specifications, and ship first versions
- Design services, data models, and APIs; manage infrastructure as code
- Own services in production, including deployments, monitoring, and incident response
- Write evaluations for model-facing features and track workflow metrics
- Handle protected health information safely using least-privilege access, no PHI in logs, and auditable changes
- Build and maintain engineering skills, plugins, MCP integrations, and review bots for Claude Code and Codex
- Own features end to end across the platform in a flat engineering team
Requirements:
- 5+ years of experience building and shipping production software
- Recent, hands-on experience using or building AI harnesses beyond simple model API calls, including project instructions, tools and MCP servers, skills, hooks, subagents, and evals
- At least one personal project built and published on the web, live and usable by anyone; ideally a SaaS with working payments such as Stripe
- Strong full-stack skills in Python and TypeScript, with experience across frontend, backend, databases, and cloud infrastructure
- Comfort working in a large, established codebase
- Hands-on experience building with LLMs, including tool use, agent orchestration, structured outputs, retrieval, and evals
- Daily use of AI coding agents such as Claude Code, Codex, or Cursor; ability to configure project instructions, skills, MCP servers, hooks, and subagents, run parallel tasks, and review output
- Good product sense and ability to make UI decisions without a dedicated designer, using a component library
- Clear written communication
- Experience in healthcare or another regulated industry, HIPAA, payer and claims workflows, EHR integrations, or HL7/FHIR is nice to have
- Experience with Temporal or another durable workflow engine is nice to have
- React Native experience is nice to have
- Experience running LLM evaluations or safety checks in production is nice to have
- Experience building an agent harness, MCP server, or coding-agent plugin is nice to have
- Open-source work or internal tools used by others is nice to have
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