Javier Velasco
Tech Lead at Vercel
Madrid, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolJavier Velasco is a Tech Lead with 12 years of experience building full-stack web platforms and developer tooling from Madrid, currently leading engineering at Vercel. He combines deep frontend craftsmanship—authoring react-toolbox—with backend and edge-runtime expertise, contributing notable improvements to the widely used Next.js framework and Vercel's platform for domains and edge VMs. Javier has a history of technical leadership across startups and education, mentoring bootcamp students while shipping production-grade features and refactors. His work often focuses on developer experience, type safety, middleware APIs and runtime robustness—skills reflected both in open-source contributions and production systems. A film, music and comic enthusiast, he brings a pragmatic, product-minded approach to complex engineering problems.
12 years of coding experience
5 years of employment as a software developer
Engineer Computer Science, Engineer Computer Science at Universidad de CórdobaMaster’s Degree Smart Systems, Master’s Degree Smart Systems at University of Córdoba
Spanish, English
Stackoverflow
426reputation
147kreached
7answers
3questions
Github Skills (36)
javascript10
middleware10
domain-name10
rails-i18n10
back-end-development10
component-design10
sass10
typescript10
s610
nextjs10
ui-design10
uid10
ember-i18n10
front-end-development10
typescript-types10
Programming languages (6)
Github contributions (5)
react-toolbox/react-toolbox
Jun 2015 - Feb 2018
A set of React components implementing Google's Material Design specification with the power of CSS Modules
Role in this project:
Front-end Developer
Front-end DeveloperContributions:12 releases, 1680 commits, 527 PRs in 2 years 8 months
Contributions summary:Javier focused on enhancing the user interface and functionality of the react-toolbox library by adding display names to all components used in timepicker, fieldset, and other components. Additionally, the user integrated date and time pickers into a test component and implemented a year selector within the calendar component, further improving date selection capabilities. Furthermore, the user migrated existing components to ES6 and addressed various styling and code organization improvements.
reactcssspecificationcss-modulesmaterial-design
vercel/vercel
Mar 2018 - Jun 2022
Develop. Preview. Ship.
Role in this project:Back-end Developer
Back-end DeveloperContributions:35 releases, 42 reviews, 188 commits in 4 years 3 months
Contributions summary:Javier primarily focused on implementing and modifying features related to domain management within the Vercel platform. Their work included adding checks for `expectedPrice` during domain purchases and modifying the domain buying method within the application. These changes involved altering code within the source provider files for commands and utilities for domain management. They demonstrated an understanding of API interactions, domain registration processes, and error handling.
hostingshipcloudcommandjamstack
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