TLDR; The overall process was a discussion with two data scientist, a codility, another discussion with two data scientist and a final discussion with a VP. That was my last one, after that a final round in Amsterdam but I didn’t reached that. First I talked to two data scientist and discussed about my motivation to move to Adyen, my previous experience. They were very polite and the discussion was good and fluent. The codility was very easy, but very long 3 problems in 3 hours. The following interview was with another two data scientist. Again some talking about my background and some questions about machine learning. No coding. The questions were easy about basic concepts of picking features, how the algorithms work and tuning hyper-parameters. My suggestion here is to study a bit in an abstract level how to tackle a machine leaning problem (like in Kaggle). Be careful with this one because as it is just a conversation any miss-interpretation will be punished. Try to be as clear as possible. The interview with the VP was very cool. Good questions about my experience solving problems and the proposed solutions. Also, some questions about motivations to move Amsterdam.