Product Engineer

Why this role exists

Agents break silently. They call the wrong tool, forget what the user said three turns ago, and loop until someone pulls the plug. Soon they'll be responsible for the majority of the world’s economic work, and most teams won't even know when they fail.

Making agents reliable is the problem Lemma exists to solve. That means catching the unknown unknowns, the failures nobody thought to write an eval for, and closing the loop end to end so they get fixed, not just flagged. It's the foundation for building agents people can actually trust and the future of self-improving systems.

Finding failures is only half of it. The other half is a human problem. Every issue we surface is more homework for a team that already has too many priorities. If we can't decide what matters, rank it, and put it in front of the right person at the right moment, we've just built a noisier inbox.