SF startup building infrastructure to observe AI agents in production

Full Stack Engineer

San FranciscoOn-site$150K - $275K0 - 5 years
You'll spend mornings tracing a flaky evaluation pipeline—Python, Node, a dozen microservices talking past each other—and afternoons rebuilding the dashboard that surfaces those failures to non-technical users. One week it's optimizing PostgreSQL queries against millions of agent traces; the next it's prototyping a new React component for comparing model versions side-by-side. The codebase is young enough that your commits shape patterns, not just patch them.

What they're looking for

  • 2+ years shipping production code across the stack, with shipped TypeScript/React and Python projects you can discuss
  • Comfort working inside Next.js app router, server components, and the cache boundaries they impose
  • Experience designing schemas and writing performant SQL in PostgreSQL, not just ORM abstraction layers
  • Track record of debugging distributed systems where the failure is three hops from the symptom
  • Genuine curiosity about LLM behavior—not prompt engineering prowess, but rigorous thinking about how to measure and constrain agents

Tech stack

TypeScriptReactNext.jsPythonNodeJSPostgreSQL

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This role is one we're recruiting for on behalf of a client company; the client's identity is kept confidential at this stage. A Fluency recruiter will follow up with details.