Long process, but apparently fair. First you have to perform a task and then, if you pass, two more interviews. I made until the last interview and think everyone were very pleasant.

I applied my CV and Motivation Letter (answers to 4 questions provided by trivago on their website). A few days later they got back to me with an assignment (data analysis and brand marketing knowledge) that I needed to finish prior to a video interview 4 days later. The video interview is built in a system without human interviewers, just a set of 7 questions (3 of which are revealed in advance) about the assignment, my knowledge about trivago and about marketing. More than 3 weeks after the video interview, I received an invitation to take part in a Skype interview that happened 5 days later. There were 3 interviewers each of which was talking to me separately for half an hour. There were a case study on negotiation, questions about my personality and how I deal with common challenges at work. The atmosphere was quite relaxing (apart from the case study, which is understandable). 10 days after the interview I received the offer.