CrossAge Studio · .NET + AI
I'm Sven. For about eight years I've shipped C# and the Microsoft stack in production — APIs, Blazor and Razor apps, desktop tools, Azure. Lately I've been wiring real LLM features into those products: not a chatbot bolted on the side, but AI that earns its place in the workflow. This whole site, and the assistant that has opinions all over it, is something I built to prove that.
Available now — taking on part-time contract work (up to ~24 h/week), mostly remote.
Three things I'm genuinely good at, in the order I'd reach for them.
You have a working .NET app and a workflow that an LLM could genuinely speed up. I add it properly — grounded in your data, with a path from prototype to something you can actually run in production.
From €95/hr ex. BTW
The bread and butter: building and improving real applications. APIs, web apps, the database behind them, and the Azure they run on. Tested, readable, and handed over so your team can keep going without me.
From €85/hr ex. BTW
The corner most contractors avoid. I've shipped WinUI 3, WinForms and MAUI, and I'm comfortable walking into an older .NET codebase to modernize it without setting it on fire.
From €85/hr ex. BTW
I'd rather show you working software than a slide deck. A few things I've built — the site you're reading is one of them.
A persistent AI assistant with its own local memory, observation bus, and distillation loop — wired into a real desktop authoring app and used to draft, edit, and comment on content. My flagship piece on doing AI properly.
AI · LLM · C# · local SQLiteEnd-to-end platform: a Blazor Server front end, an ASP.NET Core API, EF Core + SQL, Azure Blob media with an auto-WebP pipeline, transactional email, analytics, RSS/SEO — and a WinUI authoring client behind it.
.NET 10 · Blazor · ASP.NET Core · Azure.ztsl audio containerA bespoke audio format and a Blazor player package (shipped as a NuGet RCL) that streams it with range requests and synced lyrics. Built when off-the-shelf players didn't do what I needed.
Audio · Blazor RCL · streamingA cross-platform (Windows / Android) MAUI app for live stream control — real-time scene, audio and status switching over OBS WebSockets and the Twitch API. Released on the Play Store.
MAUI · OBS · Twitch API · releasedMore on GitHub, and the long version of most of these is written up here on the blog.
Honest starting points, not a vending machine. Final pricing depends on scope, risk, urgency and contract shape — but you won't get a mystery number.
All rates indicative and ex. BTW. Fixed-scope projects are quoted up front from estimated hours, complexity and risk — so you know the number before we start.
I came up the slightly unusual way: years shipping production .NET across automotive, publishing and payments, then a stint teaching software development before going independent as CrossAge Studio. The teaching wasn't a detour — it's why I care that the code I leave behind is something the next person can actually read and extend.
Tell me what you're building or stuck on. A couple of sentences is enough to start — I'll reply, usually within a day or two.
We use anonymous analytics (Microsoft Application Insights) to understand how people read our articles — scroll depth, time on page, that sort of thing. No ad networks, no third-party trackers. See what's stored or read the privacy policy.
