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Idler

San Francisco, CA, USA14+ employeesSeed raised
Reinforcement learning environments.

Reinforcement learning environments.

YC S25

About the Company

Idler builds reinforcement learning environments that teach AI models to code like 0.01% engineers. Our training environments are based on real-world coding scenarios that frontier models will actually encounter.

We've closed a multimillion-dollar contract with a leading foundation lab (the largest they've issued to date), and demand is outpacing our capacity to deliver. We're scaling fast to build the training data layer for frontier AI. Every breakthrough model will need environments like ours to learn real-world skills at scale.

We're a tight-knit founding team in San Francisco. We move quickly, think deeply about what makes good training data, and play to win. Join us if you want to win too.

Tech Stack

TypeScript, React, NextJS, Postgres, NodeJS, various AI completions

Founders

Ivan Chub
Ivan Chub

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

Nalu Concepcion
Nalu Concepcion

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.

Tony Goss
Tony Goss

Dark Forest, Zupass, US Census Bureau. Pro ultimate player, state champion coach, and Dominion nerd

Ready to start your space career at Idler?

Shipping like we're funded. We're not. No affiliation.

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