Letta

Letta is an artificial intelligence research lab and startup based in San Francisco, California. The company builds self-improving artificial intelligence systems, specifically stateful agents designed to remember everything, learn continuously, and improve themselves over time. Their core technology stems from MemGPT, an open-source virtual context management operating system originating from UC Berkeley’s Sky Computing Lab. Letta serves corporate clients by powering production systems for companies such as 11x, Bilt Rewards, Kognitos, and Hunt Club, allowing digital agents to learn and adapt within real-world environments.

The organization focuses heavily on machine learning research and infrastructure, working on memory models, context repositories, token-space continual learning, and sleep-time compute. Their published software includes the Letta Agent, which evolves its memory, identity, and capabilities based on ongoing experience. The company publishes its findings through academic papers, technical reports, blog posts, and open-source code repositories to advance the field of agentic systems.

To support these research and engineering initiatives, Letta hires for specialized technical roles such as Research Engineers and Scientists focusing on memory, self-improvement, and post-training, alongside Software Engineers for agent harnesses. According to the open positions, the team consists of small, tight-knit groups operating strictly in-person, 5 days a week from the downtown San Francisco office with no hybrid or remote flexibility offered.