Rens Groothuijsen
Software Engineer at Carapax IT - Technologie met maatschappelijke impact
Eindhoven, North Brabant, Netherlands
Summary
👤
Senior🎓
Top SchoolRens Groothuijsen is a Java-focused software engineer with a decade of experience delivering scalable applications across education, media, and security domains. Based in Eindhoven, he currently builds software with societal impact at Carapax IT, after shaping student-information systems at CACI and developing cloud solutions for the digital TV industry at Merapar. An active open-source contributor, he enhanced Mastodon’s UI—fixing password confirmation, media handling, and search UX—demonstrating a practical eye for frontend polish. His academic background blends a MSc in Psychology from Maastricht University with a Bachelor's in Information Technology from Fontys, pairing human-centered insight with engineering rigor. His career also spans IT security policy design and SSO implementations, underscoring a security-minded, end-to-end approach to delivering robust software.
11 years of coding experience
3 years of employment as a software developer
MSc., Psychology, MSc., Psychology at Maastricht UniversityBachelor's degree, Information Technology, Bachelor's degree, Information Technology at Fontys Hogeschool Eindhoven
English, Dutch, German
Github Skills (8)
javascript10
web-development10
javascripts10
front-end-development10
react10
css7
html7
activitypub3
Programming languages (10)
Github contributions (5)
mastodon/mastodon
Dec 2021 - Dec 2022
Your self-hosted, globally interconnected microblogging community
Role in this project:
Front-end Developer
Front-end DeveloperContributions:1 review, 5 commits, 10 PRs in 1 year
Contributions summary:Rens primarily contributed to the user interface and front-end components of the Mastodon project. They focused on fixing errors related to password confirmation, modifying the display of hashtags, and implementing the display and control of audio attachments. This work included adding functionality for sensitive media warnings and enabling visual elements related to media visibility within the application. Additionally, they worked on improving the search popout feature.
social-networkwebfingerpixelfedhosteddocker
rgroothuijsen/loki
Apr 2023 - Mar 2025
Like Prometheus, but for logs.
Contributions:100 pushes, 6 branches in 1 year 11 months
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