Sumo Logic Frontend Developer interview questions

The interview comprised of 2 rounds and HM round. Good People and very focussed interviewers. Both rounds went well. They gave the feedback after 1 week and that too after I called them. They should tell candidate what went wrong and what the candidate could not do well in, after all the candidate also invests his time in process. Everything appeared great during the interview and interviewers were also satisfied with answers