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Primitive Labs is a Y Combinator and a16z Speedrun-backed startup building behavioral intelligence for AI-native software. Founded by former Amazon AGI and AWS engineers, the team creates agents that model human behavior—thinking, buying, and consuming—allowing product teams to test features against realistic user simulations before shipping to production.
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Founding Engineer at Primitive Labs in San Francisco, CA, you’ll own the full stack—from infrastructure and agent architectures to computational cognitive science. Primitive Labs is founded by former Amazon AGI and AWS leaders and backed by a16z Speedrun and Y Combinator to build the behavioral intelligence layer for AI-native software. The role offers the opportunity to shape the technical.
Member of Technical Staff, Research (+ Equity) at Primitive Labs in San Francisco, CA, where you will lead the development of simulation architectures and memory systems for high-fidelity behavioral intelligence. Primitive Labs is redefining AI by making human behavior a core primitive of software development and is backed by a16z Speedrun. This role offers the chance to define a research.
