The interview was by Skype, with a very nice girl, it was more about personal skills than experience. I was applying for an intern position so I guess is normal.
I just applied online and I get a quick answer on my mail, at that time I was not living at Berlin and they make me all the process super easy.
Then I had a Skype interview and then a personal meeting at their headquarters at Alexanderplatz, later on we move to Xberg