The first round of the interview process was a skype interview with one of Zalandos recruiters. It was a very friendly chat where we covered some basic questions (salary expectations, possible start). Nothing related to the real topic. It took approximately 45 minutes. I got an email the next day with a positive feedback so there will be two more rounds. Next is 1.5 technical interview with coding test.

Technical screening interview. simple algorithmic and data science questions: making a histogram from a list of double vaues, finding an element in a sorted list, cross-fold validation, overfitting... talking about CV and previous projects.