Jeroen Coumans
Product Designer Frontend Developer at HubStar
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolJeroen Coumans is a product designer and frontend developer with 13 years of experience building user‑centric web applications from startup to scale‑up. He is currently Product Designer & Frontend Developer at HubStar, and previously co-founded Lone Rooftop where he led frontend, product, and later CTO/Information Security roles, guiding the company through ISO27001/27010 certification and crafting data‑driven interfaces (including a 'Google Analytics for buildings' concept using wifi probes). His background spans roles as Co‑founder at The ANT Works, Lead UX & Design at TMG Online Media, and Lead Designer at Hyves, giving him a breadth of experience in UX, design systems, and front‑end engineering. In open source, he contributed to the Material‑UI project, focusing on robust dropdown behavior and proactive warnings for invalid indices, showcasing practical React/JS expertise. Based in Amsterdam, Netherlands, he holds a Master in Communication & Multimedia Design and a Bachelor of Arts & Science, underscoring a blend of design thinking and technical fluency.
13 years of coding experience
11 years of employment as a software developer
Master, Communication & Multimedia Design, Master, Communication & Multimedia Design at Katholieke Hogeschool LimburgBachelor, Arts & Science, Bachelor, Arts & Science at Maastricht University
Dutch, English
Stackoverflow
884reputation
20kreached
1answer
0questions
webpack
top-5%
javascript
top-5%
timezone
top-5%
momentjs
top-5%
Github Skills (13)
javascript10
javascripts10
react10
webpack9
react-component9
system-design9
react-components9
timezone9
system9
nodejs9
momentjs9
material-design8
material-design-38
Programming languages (5)
Github contributions (5)
mui/material-ui
Mar 2015 - Apr 2015
Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:7 commits, 2 PRs, 2 comments in 14 days
Contributions summary:Jeroen primarily focused on improving the functionality of the DropDownMenu component within the React component library. Their contributions addressed issues related to handling negative `selectedIndex` values to prevent crashes and unexpected behavior. They implemented warning messages for invalid index values and provided a solution to default the selected index to 0. The user also made a merge commit, integrating their changes and other component enhancements.
reactmuimaterialjavascriptmaterial-design
jeroencoumans/andamio
Jul 2012 - Sep 2013
Contributions:717 commits in 1 year 1 month
cssmini-csspatternscss-designcss-framework
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