Delba de Oliveira is a Staff Developer Advocate and DX Engineer at Vercel who built Next.js Docs and the Next.js Learn platform, teaching millions of developers about React and Next.js. She transitioned from medicine and customer service into engineering, famously entering tech when a colleague asked her to 'open a GitHub issue.' Known for her visually rich educational content, conference keynotes at Next.js Conf, and her hobby as a videographer, she combines technical depth with storytelling instinct - bridging complex concepts and accessible learning in the React ecosystem.
Guillermo Rauch is the founder and CEO of Vercel, the frontend cloud platform that powers millions of developers and some of the world's most visited websites. A self-taught engineer from Lanús, Argentina who never finished high school, Rauch built two of JavaScript's most widely used open-source libraries (Socket.IO and Mongoose), co-created Next.js — the world's most popular React framework — and turned Vercel into a $9.3 billion company with $340 million ARR. He is also one of the most prolific angel investors in tech, with over 700 known investments, and recently launched v0, an AI-powered coding tool with over 3.5 million users.
Josh W Comeau is a Montreal-based frontend developer, indie course creator, and one of the most beloved CSS and React educators on the internet. After stints at Unsplash, Shopify, Khan Academy, and Gatsby, he left corporate engineering in 2020 to build interactive, deeply original courses that generated over $550,000 in presale revenue. His CSS for JavaScript Developers and The Joy of React courses have taught more than 28,000 developers through a teaching style that blends interactive widgets, mini-games, and the rare gift of building genuine mental models rather than just showing code.
Lee Robinson is a developer educator and engineering leader who spent five years at Vercel scaling Next.js to over a million monthly active developers, rising from individual contributor to VP of Developer Experience. He now serves as Head of AI Education at Cursor, teaching developers how to build software with AI-powered tools. Known for creating free courses like Mastering Next.js and React 2025, his newsletter 'Optimism (for the web)' and 234K+ Twitter following reflect his belief that great technology should be easy to understand and interesting to learn.
Rauno Freiberg is an Estonian Staff Design Engineer at Vercel who blurs the line between design and engineering with surgical precision. Known for his obsession with invisible details - the micro-interactions, animations, and tactile feedback that make software feel alive - he built cmdk (downloaded millions of times weekly), wrote the seminal 'Invisible Details of Interaction Design' essay, and created Devouring Details, an interactive design education platform. He previously shaped the Arc browser at The Browser Company. His philosophy: code is the material, and mastery of HTML, CSS, and JavaScript is the only honest path to great interfaces.