Marcus Kimpenhaus

A selection of open-source contributions, tools, and talks from the past years.

KubeOps — dotnet-operator-sdk

KubeOps is a Kubernetes Operator SDK for .NET, strongly inspired by kubebuilder. It enables developers to build production-grade Kubernetes operators using C# and ASP.NET Core — bridging the gap between the .NET ecosystem and Cloud Native infrastructure.

Contributing as collaborator since November 2025.

2025
Fake the Unfakeable

Talk about Isolating Code Under Test with Microsoft Fakes©

Find slides here and modules on GitHub

2014
Was dir Trivialbeispiele in Async and Await nicht sagen!

Talk about evolution of asynchronous development and patterns when using async/await

Find slides here and modules on GitHub

2014
ASP.NET MVC NUnit

An Visual Studio extension which adds a project and an item template to generate NUnit based tests of ASP.NET MVC 3 and ASP.NET MVC 4 applications. NUnit as NuGet package reference is already is included.

Code on GitHub

2011
WP-Mail-Validator

An anti-spam plugin for Wordpress CMS. It provides mail-address verification in 5 ways:

  • syntax of mail-addresses
  • mailserver host
  • mx-record of mailserver
  • user-defined blacklist
  • trashmail services

Hosted at Wordpress plugin repository
Code on GitHub

2004