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 designing user-centric web products and leading multidisciplinary teams from prototype to ISO-certified operations. He co-founded data-driven startups that turned passive signals (Wi‑Fi probes, patents) into actionable visualizations, combining a strong UX sensibility with hands‑on React and frontend engineering. At companies from Hyves to HubStar he’s grown design teams, modernized product processes, and shipped polished interfaces while mentoring developers. He contributes to prominent open-source projects like MUI, improving robust component behavior in widely used React libraries. Based in Amsterdam, he blends product leadership and practical front-end craftsmanship, with a penchant for turning messy data into clear, decision-ready dashboards.
13 years of coding experience
11 years of employment as a software developer
Bachelor, Arts & Science, Bachelor, Arts & Science at Maastricht UniversityMaster, Communication & Multimedia Design, Master, Communication & Multimedia Design at Katholieke Hogeschool Limburg
Dutch, English
Stackoverflow
884reputation
20kreached
1answer
0questions
webpack
top-5%
javascript
top-5%
timezone
top-5%
momentjs
top-5%
Github Skills (11)
javascript10
react10
webpack9
react-component9
system-design9
react-components9
timezone9
system9
nodejs9
momentjs9
material-design8
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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