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Principal Software Engineer, AI-Native Care Platform (Staff-Plus IC)

legion health • United State
Remote Visa Sponsorship
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Own the hardest systems in Legion Health's regulated clinical care platform, including the factory spine, clinical work spine, production agent operations, and data/metrics estate. Architect and ship at high velocity with heavy AI agent leverage, ensuring clinical-grade correctness, auditability, and fail-closed defaults. This is a senior individual contributor seat for someone with 10+ years of experience who thrives on taking ambiguous, load-bearing problems end-to-end.

Key Highlights
First company ever to receive regulatory authorization for AI to prescribe psychiatric medications
Autonomous AI-native care delivery platform automating 95% of administrative work
Own entire problem spaces: from 'this is a mess' to 'this is done and documented'
Backed by Y Combinator and leading venture capital firms
Tens of thousands of patient visits in 2 years with industry-leading NPS and retention
Key Responsibilities
Own the factory spine: move shipping from 500–1,000 PRs a month toward 10,000 while maintaining quality and rigor, including merge gates, migration safety, canary and rollback.
Own the clinical work spine: the event-sourced system of record for clinical work (orders, tasks, commands, receipts) with auditability and fail-closed checks.
Own agent operations in production: decide how LLM agent autonomy expands and ratchets upwards as proof accumulates, with tool use, checks, and receipts.
Own the data and metrics estate: warehouse, analytics platform, and pipelines that report what actually happened.
Architect and ship daily at high volume with a fleet of AI agents, writing docs and proactively communicating decisions.
Technical Skills Required
TypeScript Node.js Event-driven architecture
Benefits & Perks
Salary: $250,000 to $400,000 depending on experience
Meaningful early-stage equity in a category defining company
Medical, dental, and vision insurance
Flexible, unlimited vacation policy
In-person retreats and meal stipends
US Visa Sponsorship available
Autonomy and learning: ownership over projects with freedom to set priorities and shape processes

Job Description

Job DescriptionAt , we believe everyone deserves fast, affordable, and world-class health care, and we’re developing the AI infrastructure to deliver it ourselves at world scale.Legion is building (the AI doctor), starting with psychiatry. Our AI-native care-delivery platform currently automates 95% of the administrative work required for us to deliver direct patient care. We also recently became the , allowing us to not only collapse health care’s admin costs but also its clinical labor costs—Our technical moat is hard to copy—we combine , and to deliver measurably better care to a clinically complex patient population. This has helped us produce
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