These were the best attitude to candidates and most thoughtful organization of interview process which I have seen so far (I have seen a lot). On the first contact with HR, he explained in details what to expect throughout an interview process and after it and send preparation guidelines for the next stage. The next interview (algorithm coding task) was scheduled in 10 days. The interviewer read my cv in advance so no wasted time to recount it. Both HR and interviewer were nice to deal with: responsive, not intrusive, qualified, engaged in an interviewee success - just perfect. The only unpleasant thing was what for a position related to data science / machine learning is still being asked questions like for pure software developer position. Unfortunately it is also common in other IT companies and I was warned so my impression is still good.