They want to seem cool but are very petty. No detailed explanation given after the interview, not even a single line explanation after so many rounds of interview. Interviewer seemed satisfied with open ended discussion but still they just simply rejected without even giving the reason(initially they will send a big cool mail on how they will give you a elaborated feedback but none given).

I was informed simple process of two rounds - First coding in which an exercise is shared to be completed in 4 hours and solution sent online. Second was system design. I cleared both rounds and received a verbal congratulations and confirmation for employment. However, there was no response from HR or the recruitment agency for more than one and a half month. Multiple follow ups and call went in vain. After nearly two months, I finally got on call with HR and was informed that interview was fine but they wont be able to offer. No valid reason provided. Upon asking whether it was for salary expectation, HR denied and affirmed that they dont have any budget constraints. Very unprofessional. They simply do not value candidate's time and effort.