Rens Groothuijsen
Software Engineer at Carapax IT - Technologie met maatschappelijke impact
Eindhoven, North Brabant, Netherlands
Summary
👤
Senior🎓
Top SchoolRens Groothuijsen is a software engineer with 11 years of experience specializing in Java while comfortably working across multiple languages and cloud platforms. He currently builds education-focused systems at Carapax IT after contributing to OSIRIS integrations at CACI and developing cloud solutions for the digital TV industry. Rens blends backend expertise with front-end polish—his open-source contributions to Mastodon improved UI features like hashtag displays, audio attachments and sensitive-media handling. With a background in IT, psychology, and hands-on security and SSO work from early internships, he brings a pragmatic, user-centered approach to building reliable integrations and interfaces. Based in Eindhoven, he enjoys solving cross-domain problems that sit between infrastructure, security, and user experience.
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 (7)
javascript10
web-development10
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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