Harry Oosterveen
Owner Developer at HarryOnline
The Hague, South Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolHarry Oosterveen is a seasoned web developer and entrepreneur with over 14 years of professional experience and more than 25 years working on the web, currently running his own development studio, HarryOnline, from The Hague. He has held senior frontend and lead web roles across Dutch tech and education companies, delivering polished user interfaces and pragmatic product solutions. A hands-on contributor to the privacy-focused Umami analytics platform, he improved locale-aware UI formatting and real-time session UX—illustrating his attention to internationalization and data-friendly interfaces. His background blends technical depth in frontend engineering with long-standing experience in international development and communication dating back to roles with FAO and IRC WASH. Colleagues know him for solving practical problems thoughtfully and shipping stable, user-centered interfaces rather than chasing the latest trends.
14 years of coding experience
14 years of employment as a software developer
MSc Electrical Engineering / Development Studies, MSc Electrical Engineering / Development Studies at University of TwenteVWO, VWO at Menso Alting College
Dutch, English
Stackoverflow
671reputation
49kreached
11answers
0questions
Github Skills (17)
javascript10
typescript10
ui-design10
uid10
front-end-development10
typescript-types10
typescripts10
react10
analytics9
localization9
html6
twig6
google-sheets6
php6
escaping6
Programming languages (4)
Github contributions (5)
umami-software/umami
Feb 2025 - Mar 2025
Umami is a simple, fast, privacy-focused alternative to Google Analytics.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:6 PRs, 2 comments in 26 days
Contributions summary:Harry contributed significantly to the user interface of the Umami analytics platform. They focused on localizing the UI by incorporating locale-specific formatting for dates, times, and the start of the week. Their work also included formatting hours in session tables and fixing key errors within the React components. Additionally, the user enhanced the user experience by adding keys for RealTime Session events.
chartsanalyticsstatisticsprivacyprivacy-focused
harryonline/gmailevernote
Dec 2012 - Mar 2019
Contributions:3 commits, 2 pushes in 6 years 3 months
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