I applied through a staffing agency. The process took 3 weeks. I interviewed at fitarbeiten (Frankfurt am Main)
Interview
First they sent me some translation tests to do at home, regarding translations between my mother tongue and english. After these tests, they invited me to go to Frankfurt for an interview. Before the interview there was another written test. The interview was held by 3-4 people in english (knowledge of german was not required). Not a difficult interview, but you have to be careful since they have a lot of candidates for the job and there is a lot of competition.
Interview questions [1]
Question 1
They asked me if I wanted to play Barbie Tennis. Kind of a tricky question if you are new to interview.