Senior Founding AI Software Engineer

Compensation: $190k – $270k

About the role

This is a rare and exciting opportunity for a hands-on builder who wants to take ownership and build 0 to 1 at a VC-backed, fast-growing startup. Build with former FDA decision-makers to define the future of biotech industry standards.

You don't have to know FDA or biotech, but you believe in vertical AI solutions and want to push the boundary of what is possible. Work across our entire stack from document ingestion to agents and evals, build 0 to 1 and grow with a young team. We're looking for a Senior Founding AI Software Engineer who is passionate about solving challenging problems in a highly regulated industry.

Headquartered in San Francisco, Deffai is an AI-native VC-backed seed-stage startup building an AI platform for simulating FDA regulatory intelligence, built together with former FDA reviewers. We help therapeutics companies and their investors anticipate