I was contacted by the recruiter and 2 rounds of technical phone screenings were provided. In both rounds I solved all the problems within the given time. However, 2 days after the 2nd phone screening, I got a rejection letter saying that the position is taken by another candidate with "stronger match". The recruiter was professional and acute, but also sounds indifferent about me, just want to get her job done faster. Technical interviewers during both screenings are smart and kind. However, the overall experience for me was unpleasant, since I never know what did I do wrong, everything was going so smooth until I got a punch in the face.