A recruiting web site had sent my CV to them. We had scheduled an interview with their HR, but unfortunately, she did not come without any reasonable excuse. The recruiter asked me to set another interview session with them. Finally, the second interview happened with the HR. The interview was good and she sent me a technical challenge. I did the challenge and sent to them. In my mind the thing that I did was perfect, but after 6 days they sent me a very short response and rejected me without any sensible feedback. In my opinion, their manner was not professional, and I expect at least a useful feedback!!

First part was HR online interview. Two weeks later I've got a simple test assignment. They were reviewing it for 5 weeks and in the end have sent me a generic rejection email with no feedback at all. Overall impression is that my application was just a waste of time.