AI/ML Engineer
Lemma, San Francisco, California
The role
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.
The hardest part of our product is deciding what counts as a failure.
There is no ground truth here, and no benchmark to climb. Every customer's agent is different, what "wrong" means changes from one to the next, and we have to get it right across production without anyone telling us what to look for. Being confidently wrong often costs us more trust than being right fifty times earns.
This role owns the intelligence in the loop: