Senior AI Backend Engineer - Agent Evaluation & Quality

About the role

We run production multi-agent systems that handle real work for a large base of users. As those systems grow, our biggest constraint is confidence: we need to know how well the agents perform, catch regressions before they ship, and keep quality steady as we release. This role owns that.

You'll build the evaluation systems behind our agents - the judges, test harnesses, and simulators that tell us whether an agent is working and where it's failing. The goal is to let us ship agents faster because we can trust what the evaluation tells us.

Evaluation is the focus, but it won't be the boundary. Because you'll understand the agents' failure modes better than anyone there will also be opportunities to contribute to agent development itself, building and improving the agents alongside the systems that evaluate them.