Start with a phone call with HR. They ask generic questions on past experience, had the feeling they tried to match keywords against a checklist. They really want you to name some ML models. The second step was an online multiple choice test on Hackerank. 12 questions, about 80% about statistics, 20% on basic machine learning (cross-validation, feature engineering). The third step was a 45-60 min skype call with 2 Data Scientists. The internet connection was unstable so we backed up on a regular phone call which didn't allow for proper communication. The initial questions are about your experience with ML models: they test your knowledge on as many details as possible. The second part of the interview is solving a business case on the fly. You explain how you'd approach it and why.

1) Online written test on Machine Learning, statistics. 2) HR interview. Interview process is sloppy. They will take a written test, screen your CV, ask you for interview and then send you decline e-mail for the next step. The most probable reason is availability of local candidates. Not recommended for candidates living outside Netherlands or EU. It's a waste of time.