Born in Buenos Aires, Argentina. Fascinated by computers and the internet from an early age. Loved tinkering with technology as a child, which set the foundation for his future endeavors.

Started creating open-source software, including libraries for Node.js and front-end development. Co-founded Cloudup, a platform for file-sharing and collaboration, which gained early traction.

Co-created the popular real-time web framework Socket.io, helping developers implement websockets and real-time communication more easily. Recognized as a key contributor to the open-source community.

Cloudup was acquired by Automattic, the parent company of WordPress.com. Guillermo joined Automattic briefly, learning about scaling startups and building impactful tools.

Moved to San Francisco on an O-1 Visa and founded Zeit, later renamed Vercel, with the mission of simplifying front-end development and deployment. Focused on building tools that empower developers and foster better collaboration.

Vercel

Launched Next.js, a React framework that quickly became the go-to choice for building modern web applications. Secured Series C funding for Vercel to scale its platform and continue developing tools for developers.

Next.js

Vercel became a unicorn, achieving a valuation of over $2.5 billion. The platform became widely used by companies worldwide for deploying and managing web applications efficiently. Guillermo continued to champion developer-first design principles and open-source innovation.

Joined Extraordinary Club.