Founding Engineer – AI-Native Mental Health CareHey—I'm Daniel Wilson, co-founder & CTO at Legion. I studied applied math + CS at Princeton, then led the Office Scripts + Power Automate integration at Microsoft—shipping the highest retention-driving feature in the product. Before that, I did deep learning + RL research. I'm obsessed with building AI systems that make real workflows cleaner, safer, and more autonomous. Github: hiring a Founding Engineer to own core product + agent systems end-to-end.
You'll build the layer that coordinates patients, clinicians, and AI agents as one coherent machine—tight feedback loops, high standards, and real ownership.This isn't "just infra." It's building the product heart of an autonomous care system: the workflows, the agent behaviors, the guardrails, the integrations, the UX that makes it usable, and the reliability that makes it trusted.Roles evolve quickly here—including mine. I'm looking for someone who wants to carry real weight, take full ownership, and grow into running major parts of the system—not someone who needs a perfectly scoped box to operate inside.What You'll DoOwn 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 me to debate tradeoffs, define new primitives, and decide what we build next.You don't need to be a pure backend engineer—we value great product engineers who can learn fast, make strong simplifying decisions, and grow into owning backend/agent systems.You Might be a Fit If…You've owned real systems 0?1 or 1?N, not just tickets.You think in events, state, and invariants, not just CRUD endpoints.You're either already LLM-fluent or a strong systems/backend engineer who can get dangerous fast.You care about velocity and correctness—moving quickly while keeping things understandable and robust.You like small, high-candor teams and direct feedback.You want to see your work go live in production weekly, not sit on a roadmap.Nice to HaveExperience with Node.js / TypeScript, Postgres, or Supabase.Experience with LLMs, agents, tool-calling, or RAG.Experience in healthcare, fintech, or other regulated / high-stakes domains.Experience in early-stage startups or founding teams.Our Tech StackBackend: Node.js, TypeScript, Supabase (Postgres), AWS (ECS, Lambda, S3)Frontend: Next.js 15 (App Router), Tailwind, VercelAI: OpenAI, Anthropic, tool-calling agents, embeddings + vector DBs, Langfuse-style observabilityOther: PHI security, audit trails, real-time schedulers, transcript ingestionHow to Apply and Hiring ProcessApply here: of our hiring process:Systems/portfolio deep dive (45 min) – walk through 1–2 systems you've shipped; architecture, tradeoffs, failure modes.Practical work trial (1.5 hours) – short, realistic backend/LLM-systems exercise. No LeetCode, no puzzles.Final onsite (1.5 hours) – meet the team, pair on a real issue, and talk through how you'd own a domain.Estimated time-to-hire: 7–10 daysStart date: ASAPRole Logistics, Compensation, and BenefitsJob type: Full-timeRole type: EngineeringIdeal Experience Level: Doesn't matter if you're crackedUS Visa Sponsorship: YesSalary: CompetitiveEarly-Stage Equity: 0.2%–0.8% meaningful early ownershipHealth Insurance: Medical, dental, and vision benefitsAdditional Perks: In-person retreats, meal stipends, etc.Time Off: Flexible, unlimited vacation policyWork Hours: Flexible but demanding because we're literally saving livesWork Setup: In-person @ San Francisco HQImpact: Work on something that truly matters to millions of patients and families.Autonomy and Learning: Ownership over your projects with the freedom to set priorities, shape processes, and drive outcomes end-to-end.Growth Opportunities: As we scale, we envision our top performers from our founding team stepping into expanded roles and joining our executive leadership team.Equal Employment OpportunityLegion Health is proud to be an Equal Opportunity Employer.
We celebrate diversity and are committed to creating an inclusive environment for all employees, contractors, and applicants without regard to race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, genetic information, or any other protected characteristic under applicable law. We encourage applicants from all backgrounds to apply.