There were 3 technical rounds not 2 as they mentioned first. Then after clearing all 3 technical rounds they had this delivery manager round. Where the interviewer asked so mang real time questions, impressed with answers and later rejected saying you have not used particular tool. Just waste of time, if they wanted some specific tool hands on, they should have not proceed with the candidate.

After HR interview, they do not give you feedback at all. You don't know the reason why you are not a fit for the company. With this, seems that they do not have a feedback culture in the company, red flag!