Tjerk Wolterink
Senior Software Engineer at Impulz Technologies
Utrecht, Utrecht, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolTjerk Wolterink is a senior software engineer and founder with 14+ years of hands-on experience building consumer products, backend platforms and mobile apps from scratch. He blends technical leadership and hiring experience with deep full-stack expertise—Python, Golang, Kotlin, Flutter, Android and Kubernetes—focused on scalable architectures and product-driven teams. As founder of Impulz Technologies he launched Boomrang.app (100k downloads, >2k MRR) and consumer hits like 3DWeapons (1.5M downloads), demonstrating an ability to take indie projects to large user bases. His background spans legacy desktop/mobile ecosystems to modern cloud-native systems, and he contributes targeted open-source Android UI work that reflects a long-term focus on polished UX and robust engineering. Based in Utrecht, he thrives at the intersection of startup product thinking and building the technical foundations that let teams scale.
13 years of coding experience
20 years of employment as a software developer
Master of Science, Computer Science, Master of Science, Computer Science at University of TwenteCollege Degree, General, College Degree, General at Marianum
English, Dutch, German
Stackoverflow
2,124reputation
797kreached
40answers
9questions
Github Skills (18)
android-sdk10
android-development10
java10
javas10
refactoring8
uid8
refactor8
interface-design8
ui-design8
portrait6
tablet6
mobile6
android6
querystring6
url-parameters6
Programming languages (13)
Github contributions (5)
tjerkw/Android-SlideExpandableListView
Jun 2012 - Aug 2015
A better ExpandableListView, with animated expandable views for each list item
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:62 commits, 6 PRs, 4 pushes in 3 years 1 month
Contributions summary:Tjerk primarily contributed to the development and maintenance of an Android library, specifically focusing on creating an expandable list view component. The contributions involve adding features like action listeners within the expandable area, fixing bugs related to view recycling and height calculations, and improving the overall user experience of the component. The user refactored the code to improve animation handling and state management.
animationanimatedandroidfor-eachitem
tjerkw/gimme20-android-app
Feb 2013 - Nov 2015
Contributions:6 commits in 2 years 9 months
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