I applied to the Amsterdam office through an acquaintance who was already employed at there. First round consisted of a 90 min long online test (30 questions, 3 minutes per question) on sequences, and attention to detail. Second round was a half hour long phone interview with someone from HR. Basic motivation questions. Third round was an hour long Skype interview with two of their researchers. This consisted of three parts: 1) tell them about a project you've done, 2) math puzzles, 3) questions for them. I've just heard that I may continue to the last round; face-to-face interviews at their office. Not sure I'll get an offer yet.

It generally went smoothly and professionally. The interview was well-structured, the questions were clear, and there was a good balance between discussing experience and assessing problem-solving or fit. The interviewers were engaged and allowed time for questions, which made it feel like a two-way conversation rather than an interrogation.