One of my colleagues works remote from another country and you were going to charge him $600/month. That's more than $7k per year, a good 10% of the gross salary of a senior developer in Germany. For that much money our company can contract a tax accountant just for him many times over.
Can you email me with the needs? I'm sure we can work something out. I don't think the tax accountant is able to be a local liable employer, like we are.