Idler

Reinforcement learning environments.

Y CombinatorSummer 2025ActiveB2BEngineering, Product and DesignReinforcement Learning

What they do

Problem

AI coding models lack realistic training that prepares them for complex, real-world production programming tasks.

Solution

Idler provides reinforcement learning training environments based on real-world coding scenarios to teach models to code at expert human levels.

Who it's for

AI labs and companies developing and training code-generation models.

Founders

Ivan Chub

Founder

Idler. Previously cofounder of Dark Forest, 0xPARC, Zupass, Hack Lodge; also previously at Facebook, Dynasty, AppSheet.

LinkedIn · X

Nalu Concepcion

Founder

currently: building RL environments. formerly: orchestrated 500+ person parties, monthly @ notsominimoments · eng @ msft · fellow @ notable capital · product @ poshmark · ds @ paymongo cornell computer science + operations research & information engineering. DM's especially open to book / movie / song recs.

LinkedIn · X