Tomasz Cielecki
Principal Engineer at Trackman
Copenhagen, Capital Region of Denmark
Summary
🤩
Rockstar🎓
Top School
Top expert inXamarin and .NET MAUI Development
Tomasz Cielecki is a Principal Engineer based in Copenhagen with 14 years of experience building mobile-first, cross-platform products, particularly using Xamarin/MvvmCross across Android, iOS and UWP. He has driven TrackMan’s mobile and kiosk offerings from hands-on development to technical leadership—owning cross-product features, CI/CD pipelines, release optimization and mentoring. A pragmatic engineer, Tomasz has a strong track record of reducing app startup times, fixing intricate lifecycle and platform integration bugs, and expanding platform support (including UWP and ExoPlayer adjustments). He’s an active open-source contributor within the .NET mobile ecosystem, improving MvvmCross samples and core framework compatibility, plus performance work on Refit’s streaming JSON handling. Comfortable toggling between front-end polish and low-level platform fixes, he combines systems thinking from his Master’s at DTU with a habit of shipping practical, maintainable solutions. He also admits to liking cheese—an honest reminder he keeps engineering human.
14 years of coding experience
14 years of employment as a software developer
Master of Science (M.Sc.), Engineering, Master of Science (M.Sc.), Engineering at Technical University of DenmarkHTX, HTX at Selandia CEU
Stackoverflow
24,306reputation
1.2mreached
827answers
28questions
cross-platform
top-5%
mono
top-5%
xamarin
top-1%
listview
top-5%
android
top-1%
android-layout
top-5%
Github Skills (39)
nuget10
json10
api-rest10
ios10
xamarin-android10
api-design10
restful-api10
uwp10
bar-code10
net10
css10
http10
xamarin10
dotnet10
barcode-scanner10
Programming languages (15)
Github contributions (5)
planetxamarin/planetxamarin
Jan 2017 - Aug 2021
We are an aggregator of content from Xamarin Community members. Why subscribe individually when you can subscribe to one convenient RSS feed, to see all the content generated by the community members in you news reader.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:24 reviews, 93 commits, 302 PRs in 4 years 7 months
Contributions summary:Tomasz primarily focused on front-end development, specifically addressing layout issues and rebranding efforts within the Xamarin Planet aggregator. Their contributions involved fixing layout problems related to CSS properties like `float` and `clear`, as well as updating the CSS to improve the overall look and feel. Furthermore, they made branding changes, including updating the website's appearance to reflect the Xamarin Planet identity.
rssaggregationnews-readerrss-feedcommunity-members
MvvmCross/MvvmCross
Apr 2013 - Jan 2023
The .NET MVVM framework for cross-platform solutions, including Android, iOS, MacCatalyst, macOS, tvOS, WPF, WinUI
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:12 releases, 203 reviews, 1310 commits in 9 years 10 months
Contributions summary:Tomasz's commits primarily involve updating Nuget packages and making code adjustments within the MvvmCross framework, focusing on Android-specific support libraries and projects. Their contributions include fixing missing references, removing obsolete code, and addressing build-related issues within the Android framework, enhancing compatibility, and ensuring proper operation. The code changes reflect a focus on refining and maintaining the existing Android platform support within the MvvmCross ecosystem.
maccatalystmvvmmauimvxc-sharp
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.