Everpure Embedded Software Engineer interview questions

Had one round of hackerrank coding challenge and one round of on-site interviews. I did well on the coding challenge and was called for on-site interviews. The recruiter I worked with was very unresponsive. I took the coding challenge and I knew I had done well. I got the 10 questions variant of the challenge and it was fairly easy. After that the recruiter did not tell me about next steps for almost 3 weeks. Then he invited me over for the on-site interview. He mentioned that there will be 2 separate rounds of on-site interviews before the final decision would be made. I had 2 interviews for the first round of on-site. The first interviewer asked me the event trigger question (as mentioned in other reviews) and the second interviewer asked me a great question which I do not want to reveal. The first interview was decent but the second one I could have done better. I did, however, really enjoy my conversation with the second interviewer. I did expect a reject after it but I still haven't heard back from the recruiter and it has been more than a month now.

4 Rounds. First is online test, 10 basic problems and 2 coding. Simple stuff. Then phone interview with manager, coding test. Another phone interview with engineer asking me how I would design CPP compiler. Again easy stuff. Then 3rd phone interview which was how to solve some bizare problem.... It was interview by a total moron. Even Recruiter was suprised how I aced 3 rounds and how bad 4th round went. Thereafter I could had continued to another round, but I decided I would not like to work with moron I encountered in round 4 and informed recruiter I do not want to continue....