# Epsilab

[Epsilab on Hacklab](https://hacklab.so/org/epsilab-com)

Startup · 4 people on Hacklab

## Links

- [Website](https://www.epsilab.com/)
- [Y Combinator](https://www.ycombinator.com/companies/epsilab-com)
- [LinkedIn](https://www.linkedin.com/company/epsilab)
- [X](https://x.com/EpsilabRL)

## About

<!-- hacklab:yc-profile -->

## YC company profile

Long horizon RL environments from real-life data

Applied AI research lab focused on RL for frontier model training. Our research and evals cover real-world environment simulation, long-horizon workflows, and multi-player agents, etc.

- **YC batch:** Fall 2026
- **Founded:** 2026
- **Team size:** 4
- **Location:** San Francisco
- **Country:** US
- **Status:** Active
- **Industry:** B2B
- **Stage:** Early
- **Tags:** Machine Learning, Reinforcement Learning, B2B, Data Labeling, AI
- **YC partner:** Pete Koomen

## Founders

### Evan Hu — Founder

Co-founder at Epsilab (F26). Previously co-founder and CTO at Shortbread (YC W23). Berkeley EECS '24

[LinkedIn](https://linkedin.com/in/evanhu1) · [X](https://x.com/vanders3nn)

### Matthew Olsen — Founder

Founder at Epsilab - building RL environments for training agents on real workflows and ultra-long-horizon tasks.

[LinkedIn](https://www.linkedin.com/in/olsen-matthew/) · [X](https://x.com/OlsenMatthew99)

### Fengjiao Peng — Founder

Cofounder at Epsilab. Previously co-founded Shortbread (YC W23), generating $500K revenue and 2M episodes sold for AI-created comics. ML Researcher at MIT Media Lab.

[LinkedIn](https://www.linkedin.com/in/fengjiao-peng/)

### Joanne Wang — Founder

Cofounder of Epsilab (F26). 2nd time YC founder - previously built Copper Health (W24).

[LinkedIn](https://linkedin.com/in/joanne-wang-156ba9154) · [X](https://x.com/joannewang_)

[Source: Y Combinator](https://www.ycombinator.com/companies/epsilab-com) · Retrieved 2026-11-02. Company information is self-reported on YC.

## Current staff

- [Evan Hu](https://hacklab.so/evan-hu) — Founder (Present)
- [Fengjiao Peng](https://hacklab.so/fengjiao-peng) — Founder (Present)
- [Joanne Wang](https://hacklab.so/joanne-wang) — Founder (Present)
- [Matthew Olsen](https://hacklab.so/matthew-olsen) — Founder (Present)