I passed three interviews, one with PM (if I understood correctly) and two further technical interviews each of which with different single developers. All in all, this, as I've understood, comprised the full cycle of interview process. After waiting for several days for their final answer, I decided to write them myself with the question for any updates and received response that they are looking for 'even more senior' candidate than me. That response was pretty strange, because in my opinion I passes all interviews successfully. When I perform weakly at solving of some problem, I see this outright, but in these interviews I really don't understand what they didn't like)

Technical Assessment (Codility) 3 questions, 150 minutes given. I would say the questions were easy and medium. Interview with team managers. They asked multiple C++ related questions. Some parallel programming questions.