Sent in an application with CV and cover letter. Got through to the next round, a task you need to solve regarding a large excel sheet. After that, the third round was a phone interview. The guy was very nice and understanding of the pressure of phone interviews etc. The questions were, in my opinion, fairly difficult and complicated. Basically brain teasers which aren’t too difficult, however with the time pressure you quickly start to sweat. Then there’s more probability etc. You need to handle maths well.