Joseย Quintas
React Engineer at MUI
Amsterdam, North Holland, Netherlands
Summary
๐คฉ
Rockstar๐
Top SchoolJose Quintas is a React Engineer with 11 years of experience building and leading multidisciplinary teams to deliver user-facing web and mobile applications. Currently at MUI, he contributes to high-profile open-source projects, improving testing infrastructure and chart components for a widely used React component library. Previously he led a development team at Lepaya, driving CI/CD, best practices, and early-stage product planning while remaining hands-on across frontend and backend stacks. He combines design training with strong engineering skills (React, TypeScript, Node.js) which helps him translate UX needs into robust implementations. A fast learner and collaborative communicator, he thrives in agile environments and enjoys tackling testing and TypeScript edge cases that improve long-term maintainability. Outside work heโs an avid cook and gamer, which he says helps him experiment with creative problem solving.
11 years of coding experience
8 years of employment as a software developer
Bachelor's degree Design, Bachelor's degree Design at Universidade Federal de Santa CatarinaBachelor's degree Design, Bachelor's degree Design at Amsterdam University of Applied SciencesAssociate's degree Information Technology, Associate's degree Information Technology at IFSC - Instituto Federal de Santa Catarina
Portuguese, English, Spanish
Stackoverflow
1,070reputation
63kreached
33answers
8questions
Github Skills (23)
javascript10
ui-components10
testing10
typescript10
chai10
typescript-types10
typescripts10
react10
vitest9
documentation9
d3js8
material-design8
react-component8
react-components8
system-design7
Programming languages (12)
Github contributions (5)
mui/mui-x
Apr 2024 - Jul 2026
MUI X: Build complex and data-rich applications using a growing list of advanced React components, like the Data Grid, Date and Time Pickers, Charts, and more!
Role in this project:
Front-end Developer
Front-end DeveloperContributions:9 releases, 1914 reviews, 787 PRs in 2 years 3 months
Contributions summary:Jose primarily contributed to the "x-charts" component library, focusing on enhancements and bug fixes. Their work involved resolving TypeScript errors within the ChartsTooltip component and improving the highlighting behavior for scatter series within the charts. Furthermore, they addressed issues related to bar charts with empty datasets and corrected errors in documentation, improving customization options and ensuring the correct rendering of the charts' elements.
datagridmui-xreact-componentreact-componentstimepicker
mui/material-ui
Apr 2019 - Apr 2026
Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:49 reviews, 27 PRs, 14 pushes in 7 years 1 month
Contributions summary:Jose primarily contributed to improving the testing infrastructure and test utilities within the MUI Material UI repository. Their work included fixing Next.js build cache issues, adapting test utilities for the Vitest testing framework, and adding documentation to crucial utility functions like `useForkRef`, `useThemeProps`, `deepmerge`, and `composeClasses`. These changes enhance the project's maintainability and testing capabilities.
material-designmaterial-uireact-component-libraryreact-componentsreact
Find and Hire Top DevelopersWeโve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.