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Software Engineer — Patient Products (backed by Y Combinator, $5M+ ARR, $23M+ raised)

Legion Health
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San Francisco, CA$160k - $325kFull-timePosted 2mo ago

About the role

Engineering role focused on AI-native mental health care at Legion Health, building an autonomous AI-driven care platform in-person in San Francisco.

Responsibilities

  • Own our event-driven backend – Architect and scale our Node.js / TypeScript / Supabase (Postgres) / AWS stack. Design schemas, invariants, and workflows that encode how psychiatric care actually operates. Turn messy real-world processes into clean state machines and event streams.
  • Build real LLM agents as coworkers – Implement tool use, retries, memory, and safety rails. Design action schemas and evaluation loops so agents can run reliably in production. Work on orchestration, context management, and multi-step workflows.
  • Shape human + AI ops UX – Build internal tools used by both humans and agents. Make it trivial to see “what happened, why, and what should happen next” in any patient journey.
  • Define world-state & simulation – Model the canonical state of a patient’s journey across time. Power alerting, routing, and decision-making from that live simulation.
  • Own data, safety & compliance – Engineer HIPAA-compliant pipelines for transcripts, events, and EHR data. Ensure PHI access, agent actions, and human overrides are all auditable.
  • Drive architecture & strategy – Work directly with CTO to debate tradeoffs, define new primitives, and decide what we build next.

Qualifications

  • Owned real systems 0→1 or 1→N
  • Experience thinking in events, state, and invariants
  • LLM-fluent or strong systems/backend engineer who can move fast
  • Velocity with correctness and robust systems
  • Enjoy small, high-candor teams with fast production release cycles

Skills

Required:Node.jsTypeScriptPostgresAWSHealthcare data compliance
Nice to have:LLM agents

Benefits

  • In-person retreats
  • Meal stipends
  • Health Insurance: Medical, dental, and vision
  • Flexible, unlimited vacation policy
  • Ownership over projects with opportunities for growth into executive roles
Last updated Sep 23, 2026. Interested? Apply on the company site.
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About Legion Health

AI-native psychiatry, built for scale and covered by insurance

Legion Health is a high-quality, AI-enabled psychiatry network where patients receive care from a provider who takes their insurance. We use LLMs and AI agents to improve care quality, streamline operations, enhance patient communications, and more.

artificial-intelligenceconsumer-health-servicestelehealthhealthcaremental-health
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