I applied through university. The process took 2 weeks. I interviewed at Hasso Plattner Foundation (Potsdam)
Interview
For the interview process there were 2 main points, (1) a case which to build a small program on a simple financial situation on interests, investments and loans. And (2) a paper, which you have to read and understand in order to answer the interviewer's questions.
Interview questions [1]
Question 1
Why are you interested in finance if you don't seem to have much of a background in this field?