Guillermo is Founder and CEO at Vercel, the AI Cloud platform powering modern web development for enterprises and startups worldwide. He is also an active angel investor through his solo VC firm Rauch Capital.

Guillermo taught himself coding at age 10 in Argentina, dropped out of high school, and moved to San Francisco at 18 where he founded Cloudup (acquired by Automattic). He created influential open source projects including Socket.IO, Mongoose, and Next.js.

Guillermo started coding at 10, met Richard Stallman at 13, and became a MooTools core developer at 16. He immigrated to the US at 18 on an O-1 visa based on his open source contributions and technical expertise.

Vercel raised $863M across 6 rounds and reached a $9.3B valuation in September 2025 with $200M ARR. The company serves millions of developers and major enterprises including ChatGPT, TikTok, and Adobe.

Next.js has become the world's most popular React framework with downloads in the past 12 months exceeding 2016-2024 combined. Vercel's v0 AI tool reached 3.5 million users, and the AI SDK gets 3 million weekly downloads.