Backend Engineer, AI Systems & Evals

You bring senior-level judgment and a track record of owning work from an ambiguous problem through a shipped result. You set priorities, make sound tradeoffs, and know when to involve others. You have deep expertise in something and curiosity that extends well beyond it. You see what needs doing, exercise judgment, and follow through without waiting for a perfectly defined brief. You already use AI tools in your work, question their output, and stay responsible for the result. You’ve built and operated production backend systems, including the less glamorous work of debugging and recovery. You can set technical priorities, make architecture and quality tradeoffs, and own their consequences in production. You’re comfortable with TypeScript, APIs, relational data, and asynchronous or distributed systems. You’ve evaluated an AI system beyond trying a few prompts, or can demonstrate a rigorous approach to measuring quality. You can connect infrastructure decisions to product quality and explain where the evidence is still uncertain.

Location and travel San Francisco preferred US remote by exception. Approximately once per quarter. What we offer

Ownership of a meaningful part of the product or community, with direct access to the people building it. Comprehensive health, dental, and vision coverage. Flexible time off. Put care into the work, and take the time you need to rest.