# Caleb Peffer

> Caleb Peffer is the San Francisco-based co-founder and CEO of Firecrawl. A University of New Hampshire computer science alumnus, he worked on HallHub, FlutterBricks and SideGuide before co-founding Mendable. Firecrawl grew out of the web-data infrastructure the team needed for Mendable; in September 2026 it launched Alexandria alongside a $75 million Series B.

- **Role:** Co-founder and CEO at Firecrawl
- **Organizations:** Firecrawl, Mendable, SideGuide, FlutterBricks, HallHub, YouScheduler
- **Education:** Computer science studies; identified by the university as class of 2022, University of New Hampshire, Y Combinator
- **Known for:** Recipient of the 2022 William and Joan Grant Memorial Entrepreneurship Prize at UNH., Member of the SideGuide team that won second place and $10,000 at the 2022 Holloway competition., Co-founded developer education business SideGuide, admitted to Y Combinator S22.

## Career timeline

- **2019** — Joined YouScheduler as a software development intern; built features and a front-end testing suite.
- **2020** — Presented HallHub with Nick Camara in the UNH Holloway competition.
- **2021** — Worked on HallHub with support from the UNH ECenter Summer Seed Grant.
- **2022** — SideGuide won second place and $10,000 in the Holloway competition. Peffer received the William and Joan Grant Memorial Entrepreneurship Prize. SideGuide entered YC S22.
- **Before April 2024** — Co-founded Mendable, an AI documentation chat product; its ingestion infrastructure led to Firecrawl.
- **2024-04** — Launched Firecrawl with his co-founders.
- **2025-08** — Firecrawl announced a $14.5 million Series A led by Nexus Venture Partners.
- **2026-09** — Firecrawl launched Alexandria and announced a $75 million Series B led by Smash Capital.

## Achievements

- Recipient of the 2022 William and Joan Grant Memorial Entrepreneurship Prize at UNH.
- Member of the SideGuide team that won second place and $10,000 at the 2022 Holloway competition.
- Co-founded developer education business SideGuide, admitted to Y Combinator S22.
- Co-founded Firecrawl, which reported more than 1.5 million users in September 2026.

## Latest updates

- **2026-10** — Firecrawl introduced a free Government & Legal Index covering 30 million US government pages on October 22.
- **2026-09** — Peffer announced Alexandria and a $75 million Series B on September 22; the company reported more than 1.5 million users.

## Links

- Website: https://www.firecrawl.dev/
- LinkedIn: https://www.linkedin.com/in/caleb-peffer/
- Twitter/X: https://x.com/CalebPeffer
- GitHub: https://github.com/calebpeffer

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Profile page: https://yespress.io/caleb-peffer
Published by YesPress — https://yespress.io
Last updated: 2026-10-25