Fons Sonnemans
Software Engineer at Reflection IT
North Brabant, Netherlands
Summary
👤
Senior🎓
Top SchoolFons Sonnemans is a seasoned software engineer and long-time Microsoft trainer and coach with over three decades of involvement in development and consulting and 11 years of focused professional experience. He brings deep expertise in C#, XAML, UWP/WinUI, WPF and Blend, and has contributed front-end UI components to the well-regarded Windows Community Toolkit within the .NET Foundation. As a Microsoft MVP, he blends hands-on engineering with public speaking, mentoring and training, helping developers adopt practical UI patterns like the OnDevice markup extension he implemented. His background includes consulting roles at Rijnhaave Automatisering and Atos Origin, reflecting a strong enterprise and tooling orientation. Based in North Brabant, Netherlands, he pairs technical work with community engagement and unusual personal pursuits—he’s a ballroom dancer and avid badminton player—bringing energy and communication skills to developer education and open-source collaboration.
11 years of coding experience
Fontys University of Applied Sciences
English
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (11)
uwp10
winui10
csharp10
xaml10
dotnet-core10
mvvm9
windows-app-sdk8
dotnet7
dotnet-new7
windows6
keyboard-shortcuts6
Programming languages (6)
Github contributions (5)
CommunityToolkit/WindowsCommunityToolkit
Oct 2018 - Dec 2018
The Windows Community Toolkit is a collection of helpers, extensions, and custom controls. It simplifies and demonstrates common developer tasks building .NET apps with UWP and the Windows App SDK / WinUI 3 for Windows 10 and Windows 11. The toolkit is part of the .NET Foundation.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:3 reviews, 23 commits, 5 PRs in 1 month
Contributions summary:Fons primarily focused on UI component and feature development within the Windows Community Toolkit. Their contributions involved implementing the OnDevice markup extension, which allows for UI customization based on the device family. Additionally, the user made updates to existing controls such as the GridSplitter and MarkdownTextBlock, enhancing functionality and fixing issues. Furthermore, they added a sample page demonstrating the use of the OnDevice markup extension.
mvvmwindows-sdkc-sharpcustom-controlswindows-10
sonnemaf/ReflectionIT.Analyzer
Mar 2017 - Jan 2023
Contributions:31 commits, 26 pushes, 1 branch in 5 years 11 months
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