Senior Backend Engineer

*The role *

You'll take over day-to-day backend ownership from our founding engineer, who is shifting to product. The core of the job is building: new API servers and data models across our platform — some already in flight, more planned — on Python and Azure. You'll also maintain and extend our production multi-agent system (Python/LangGraph fronting a healthcare data warehouse): it's largely built, and needs incremental improvement, monitoring, and steady hands. You'll carry the backend through a major go-live this fall, working directly with the founders and our external web-app development partner.

*What you'll do *

• Design and build new API services and data models — greenfield development is the bulk of the role, picking up in-flight work and starting planned services from scratch.
• Maintain and extend the production LangGraph multi-agent backend: incremental capabilities, tool integrations, monitoring, and reliability.
• Design and build multi-tenant access control: per-organization data isolation, credential architecture, JWT/OIDC auth flows (Auth0).
• Run the backend's Azure footprint day to day: managed identities, Key Vault, CI/CD pipelines, environment promotion (dev → UAT → prod).
• Handle healthcare data responsibly — PHI-aware design is part of the job.
• Work async with a founder-led team and an external dev shop; write decisions down.

*What we're looking for *

• 5–8 years of backend engineering with deep, current Python.
• A track record of designing and shipping API services and data models from scratch — not just extending existing systems.
• You've worked with LLM agent systems in production — LangGraph preferred, or comparable frameworks with real users behind them.
• Production Azure experience: identity, secrets, app hosting, pipelines.
• Strong SQL (SQL Server and/or Postgres) and multi-tenant data-access design.
• Auth fundamentals: OAuth2/OIDC, JWT.
• Self-directed — you'll often be the only engineer on the problem.
• Bonus: US healthcare data (claims, CMS programs), HIPAA experience, Terraform.