Guillermo Rauch
Chief Executive Officer at Vercel
Irvine, California, United States
Summary
🤩
Rockstar
Top expert inFull-stack JavaScript Development
Guillermo Rauch is a seasoned founder and CEO with 17 years of engineering leadership, currently steering Vercel from Irvine, California. He combines deep full‑stack expertise—contributions range from core Node.js libraries like Express and Mongoose to front‑end projects such as Next.js and styled-jsx—with platform work on Vercel itself (including HTTP/2 agent and deployment reliability). Earlier he co‑founded Cloudup, acquired by Automattic, demonstrating an ability to build acquisible products and teams. A prolific open‑source contributor, his commits touch high-impact projects in realtime networking (Socket.IO/engine.io), developer tooling (ncc, hyper), and testing ecosystems (Mocha, expect.js). Known for improving performance, reliability, and developer experience, he blends hands‑on engineering with strategic product leadership. One less obvious strength: he routinely moves between low‑level transport/engine work and UX polish, giving him rare fluency across the entire web stack.
17 years of coding experience
3 years of employment as a software developer
Github Skills (109)
realtime10
expressjs10
testing10
http10
test-framework10
engine-io10
websocket10
render10
web-content10
stylus10
websockets-client10
async-await10
assert10
client-websocket10
jsx10
Programming languages (26)
Github contributions (5)
Automattic/expect.js
Dec 2011 - Jan 2015
Minimalistic BDD-style assertions for Node.JS and the browser.
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:47 commits, 6 PRs, 3 pushes in 3 years 1 month
Contributions summary:Guillermo primarily focused on improving the testing framework of the expect.js library. Their contributions include adding tests for new functionalities like object and empty checks, and for exception handling with callbacks and regular expressions. They also cleaned up and extended existing tests to ensure comprehensive coverage, demonstrating a strong focus on quality assurance and test-driven development. Additionally, the user fixed typos and refactored the tests, ensuring their maintainability.
assertionbddjs
socketio/socket.io-client
Mar 2010 - Apr 2017
Realtime application framework (client)
Role in this project:Back-end Developer
Back-end DeveloperContributions:979 commits, 38 PRs, 92 pushes in 7 years 2 months
Contributions summary:Guillermo primarily worked on the engine.io-client codebase, making changes focused on ensuring the proper functioning of various transport mechanisms for establishing connections. Contributions include modifications related to WebSocket, XHR and JSONP polling transports. The user made adjustments for handling payloads with newlines as well as for adding compression to improve data transfer, especially inside of the websocket transport.
realtimebrowsersocket-iojavascriptframework
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