Jev was founded by TypeSafe AI, a San Francisco-based startup co-founded by Diogo Almeida, Erik Gafni, and Sasha Sheng.

Diogo Almeida (CEO) is a former OpenAI researcher and primary author of the InstructGPT paper, which laid the groundwork for ChatGPT and GPT-4; he is also credited as a co-inventor of RLHF.