I'm not sure what the Ruby market in Berlin looks like, or what counts as a complex project. But earning 100k and more as a freelancer is absolutely doable with

I'm not sure what the Ruby market in Berlin looks like, or what counts as a complex project. But earning 100k and more as a freelancer is absolutely doable with mobile apps, cloud stuff, or dev ops. The downside is that if you charge €100/h, you'll probably attract the sort of project where an outsourcing experiment failed catastrophically, and the deadline is tight enough that management stopped counting beans and wants an expert.