I'm Thomas Sebastian Jensen – most people just call me Sebastian.
I’m a Senior Software Engineer & Team Lead focusing on modern .NET development, building apps, tools, samples and libraries for developers around the world.
I love creating open-source packages, writing technical articles, and exploring the latest in AI, .NET, and cross-platform development.
- 💻 Focusing on C#, ASP.NET Core, Blazor, and .NET MAUI
- 🎨 Learning Swift & SwiftUI
- 📦 Publishing NuGet packages and maintaining OSS libraries
- ✍️ Writing blog posts in
- 🇩🇪 German: tsjdev-apps.de
- 🇬🇧 English: medium.com/@tsjdevapps
- 🐦 X/Twitter: @tsjdevapps
- 💼 LinkedIn: in/thomassebastianjensen
▶️ YouTube: youtube.com/@tsjdevapps- 📧 Email: [email protected]
- Building a Multi-Model Image Generation Console App with Azure OpenAI and OpenAI
- Building a Modern, Cross-Platform Weather App with Avalonia UI
- Boost Your .NET Workflow with the New TOON File Support in Visual Studio
- Compare OpenAI Models Side-by-Side with Blazor Server
- Create AI videos with Sora-2 using .NET
- Rückblick auf 2025 und Ausblick auf 2026
- DotNetEnv – Die Konfigurations-Superkraft, die du noch nicht kanntest
- Moderne Cross-Plattform-Wetter-App mit Avalonia UI
- Vergleiche OpenAI-Modelle Side-by-Side mit Blazor Server
- Desktop-Apps entwickeln – schnell, modern und plattformübergreifend mit Avalonia
If you like what I do, feel free to support me — by using my projects, sharing my work, or buying me a coffee.






