UBS Senior Java Developer interview questions

Position applied for was Java Tech V2. Process was 1. Hackerearth test - MCQ on java,sql 2. Written test 3. F2F interview L1 4. F2F interview L2 Once we clear all the rounds then there was hr round. But I got rejected in L1. I cleared hackerrank test and written test . L1 interview went for about 20 mins where I was asked some basic java, sql questions Still I have not understood the reason that why I was rejected even if I answered all the question correct. HR should provide some feedback which can help candidate to improve the gaps. Please value candidate's time.

Process is simple. 1 online mcq test on JAVA followed by 2-3 technical interviews. Questions were on core JAVA, project lifecycle, simple design problems. HR has no clue of what they are doing. They asked to fill a form after HR round and agreed on salary part. Then they asked me to send documents after a couple of days. And boom, no response! At least have some courtesy to tell even if you have changed your mind to hire a candidate.