During the selection process I was asked to find solutions for two sets of four problems, a coding challenge, then I had a video interview and a final onsite interview. The problems consisted on coding problems, where you have to provide a pseudocode implementing the strategy to return the correct solution, and math/logical problems, where you had to show the reasoning that lead you to the solution. I would say that they were thought to test problem solving skills rather than specific tech knowledge, so I would suggest not to worry if you don't remember how to implement a fibonacci heap or similar. I found them quite challenging with respect to the ones of other interviews and I also had a lot of fun. The video and the onsite interviews were more behavioral than technical based. I was a bit nervous (specially during onsite) although the atmosphere were quite relaxed and friendly. I enjoyed the whole interview process and I appreciated that during the entire process no strict time deadline were imposed in any step, so one can try his best with no hurry. Last but not least, I would suggest to practice on HackerRank if you are new to coding interview, just to gain some confidence on how to approach a coding problem.