Thank you! Unfortunately, no, I don't write in German for my clients. It's true that I did write my website in German first before translating it into English, but I am not a native speaker of German. Writing copy in your non-native language takes a long time, and it also needs proofreading by a native. The same goes for translating into your non-native language.
If you need German copy or translations, you need a native German-speaker.
And I can recommend some! Take a look at my Network page first. Otherwise, feel free to send me an email. You can tell me a bit about your project and your expectations. Then I can pass on the details of some talented colleagues.