# Paul Klein IV

> Paul Klein IV is the San Francisco-based founder and CEO of Browserbase, which provides cloud browsers and tools for AI agents and web automation. Previously a Twilio engineer and technical lead, he cofounded Stream Club, acquired by Mux in December 2021, and later directed Mux’s self-service business. He also invests through Hawk Hill Ventures and publishes essays about developer infrastructure and company building.

- **Role:** Founder and CEO at Browserbase
- **Organizations:** Browserbase, Hawk Hill Ventures, Mux, Stream Club, Twilio
- **Education:** Bachelor of Science in Computer Science; cum laude, San Francisco State University
- **Known for:** Cofounded Stream Club, which raised $2.1 million and was acquired by Mux in 2021., Founded Browserbase in 2024 and led it through a $40 million Series B announcement in June 2025., Led identity and login engineering work at Twilio and self-service work at Mux.

## Career timeline

- **2016** — Joins Twilio as a software engineering intern.
- **2017** — Recognized as a computer science departmental honoree at San Francisco State University.
- **2019** — Starts and leads Twilio’s Login team.
- **2020** — Leaves Twilio and becomes cofounder and CTO of Stream Club.
- **2021** — Mux announces its acquisition of Stream Club on December 22.
- **2022–2023** — Works at Mux in engineering management and as director of self-service; also invests through Hawk Hill Ventures.
- **2023** — Publishes An Internet Browser for AI on November 30.
- **2024** — Founds Browserbase in January; publicly announces the company and $1.8 million pre-seed backing in March.
- **2025** — Browserbase announces a $40 million Series B led by Notable Capital in June.
- **2026** — Discusses expanding Browserbase into a broader platform for web agents; the company announces Okta and 1Password identity integrations in September and October.

## Achievements

- Cofounded Stream Club, which raised $2.1 million and was acquired by Mux in 2021.
- Founded Browserbase in 2024 and led it through a $40 million Series B announcement in June 2025.
- Led identity and login engineering work at Twilio and self-service work at Mux.
- San Francisco State University computer science departmental honoree, 2017.
- Founded SF Hacks while studying at San Francisco State University.

## Latest updates

- **2026-10** — Browserbase announced a 1Password Agentic Autofill integration on October 22, enabling user-approved sign-in without returning credential values to the agent or application.
- **2026-09** — Browserbase announced participation in Okta’s Cross App Access ecosystem on September 22.
- **2026-08** — In an interview published August 5, Klein described a broader platform spanning browsers, search, fetching, model access, and managed agents.
- **2026-04** — Published Get in the token path on April 30, arguing that AI infrastructure providers can expand by optimizing customers’ agent spending.

## Links

- Website: https://klein.dev/
- LinkedIn: https://www.linkedin.com/in/paulkleiniv/
- Twitter/X: https://x.com/pk_iv
- GitHub: https://github.com/pkiv

---

Profile page: https://yespress.io/paul-klein-iv
Published by YesPress — https://yespress.io
Last updated: 2026-10-25