The process consisted of two technical interviews, both had rather trivial questions. In the second interview, the interviewer (the group leader!) kept interrupting me and barely let me answer the questions. It felt as if he already decided I am not going to get an offer even before we started so he rushed the interview to get it over with (and it only took half of the allotted time). I have no idea why I did not pass and the generic rejection email does not help in that regard. Disrespectful.