Idler YC Application
Idler went through Y Combinator in the Summer 2025 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.
- YC batch
- Summer 2025
- Industry
- B2BEngineering, Product and Design
- Team size
- 13
- Status
- Active
- Launched
- 2025
Founders
Ivan ChubFounder
Nalu ConcepcionFounder
Tony GossFounder
What Idler does
Idler builds reinforcement learning environments that teach AI models to code at expert human levels. We create training environments based on real-world coding scenarios that prepare models for the complex challenges they'll face in production.
Idler's YC application, reconstructed
Y Combinator application
Idler, Summer 2025 batch. The real form questions, answered from public data.
- Founders2
- Company7
- Progress7
- Idea4
- Equity3
- Curious2
- Batch Preference1
Company
Idler
Reinforcement learning environments
We build reinforcement learning environments that train AI models to code at expert human levels. Our product simulates real-world coding challenges so AI models can learn to handle complex, production-level engineering problems.
We live in San Francisco, CA, and plan to keep the company based here after YC.
San Francisco is the hub for AI and machine learning talent and potential early customers in product and engineering roles. Being here lets us iterate rapidly with our customers and tap into the startup ecosystem.
21 more answers in the full application
Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.
Frequently Asked Questions
Is this the real Idler YC application?
No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Idler's public data (launch notes, founder backgrounds, product description). It shows how a company like Idler would present itself to YC, not the text they submitted.
What YC batch was Idler in?
Idler was part of the Y Combinator Summer 2025 batch.
Who founded Idler?
Idler was founded by Ivan Chub, Nalu Concepcion, Tony Goss.
What does Idler do?
Reinforcement learning environments.
How do I read the full reconstructed application?
Create a free Round Funded account. The full 26-answer version of Idler's application, and every other YC batch, is in YC Insights.
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