Gertjan Jansen
Directeur & Oprichter at Volunteerly
Groningen, Groningen, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolGertjan Jansen is a seasoned founder and software leader with 7+ years of experience building user-focused platforms for education, welfare and volunteering from Groningen. He co-founded Stagedoos—used by over a million students—and now runs Volunteerly, a transparent, easy-to-use volunteer management platform while modernizing Stagedoos for secondary and higher education. Technically hands-on across Ruby on Rails, Swift and modern web stacks, he has led engineering teams, raised funding, and shipped products end-to-end at startups like Tilig and Miniem. An active iOS contributor, he improved the AppleSampler component in the popular AudioKit framework, adding tests and refactors that strengthened its MIDI functionality. Known for combining product sensibility with practical engineering, he writes publicly about scaling mission-driven platforms and practices transparent, open entrepreneurship.
7 years of coding experience
17 years of employment as a software developer
Bachelor of Business Administration (B.B.A.) Business Administration and Management General, Bachelor of Business Administration (B.B.A.) Business Administration and Management General at University of GroningenCSG Liudger
Github Skills (8)
audio10
swift10
ios10
testing10
midi-instrument9
midi9
macos7
tvos5
Programming languages (6)
Github contributions (5)
AudioKit/AudioKit
Feb 2019 - May 2021
Audio synthesis, processing, & analysis platform for iOS, macOS and tvOS
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:20 commits, 6 PRs, 10 comments in 2 years 3 months
Contributions summary:Gertjan primarily focused on enhancing the AppleSampler component within the AudioKit framework. Their contributions included making MIDI event attributes publicly available, adding channel arguments to existing methods, refactoring the AppleSampler to inherit from PolyphonicNode, and adding tests. The user added tests for the volume, pan, and amplitude of the AppleSampler. They also added tests for the AppleSampler's start and stop functions.
swift-playgroundsapplemusicmidisynthesisios
gertjanjansen/AudioKit
Feb 2019 - Apr 2023
Swift audio synthesis, processing, & analysis platform for iOS, macOS and tvOS
Contributions:15 pushes, 7 branches in 4 years 3 months
swift-playgroundsaudiokittvosaudiounitpitch-detection
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