Proximal

Proximal builds RL environments for long-horizon software engineering grounded in real codebases. We're working with frontier labs and AI startups to help them improve their models and coding agents.

We believe we've only scratched the surface of what's possible in automating software engineering today. Coding agents are powerful, but there is still a big gap between them and end to end autonomous software engineering. We help labs fill in this gap by providing them real high quality coding envrionemnts.

Team

Justus Mattern: Led RL research & data at Prime Intellect. He was a core contributor to their RL training framework prime-rl, their reasoning datasets Synthetic-1 & Synthetic-2 and their latest reasoning model Intellect-2.

Navid Pour: Was the second founding engineer / researcher at Cursor. He was part of the original team that took Cursor tab from an idea into production and co-led multiple experiments on coding agents. Also built infrastructure for browser agents at Browserbase.

Calvin Chen: Built a logistics software company that he bootstrapped to $1.5M ARR and sold for $9M. Most recently he cofounded Fetchr with Navid, building AI agents for shopping.

For inquiries, you can reach us at contact@proximal.so.