The interview day was a bit chaotic, but people were nice and the overall procedure was not stressful. I talked with 4-5 people in total and gave a short presentation. What was frustrating is the feedback part. The feedback was delayed by 2 weeks comparing to the indicated day and was quite surprising. The company called my previous employer (who was very positive about his recommendation in call) and all of a sudden I receive a call with rejection, with super-vague reasoning: lack of communication and technical skills (which is weird because I didn't have a single technical question). The HR-manager was not able to elaborate further, because she said that this is the only feedback she got. And my inquiry about a more detailed reasoning to the head of the department was simply ignored. I believe, that if people spend considerable amount of time in interview and its preparation, they deserve to receive more information than simple "no".