I'm used to work since 2008 in places where the working language is English.
I don't mind to have a technical conversation in German but don't expect
a formal (and exempt from errors) email from me in such language.
I work with GNU/Linux since 1996. I've deep knowledge of its architecture and features.
I've given Kubernetes training among several organizations I worked for, but I wouldn't be developing extensions for it.
Direktester geht's nicht! Ganz einfach Freelancer finden und direkt Kontakt aufnehmen.