UST Sr. Software Engineer interview questions

First round technical screening (Pre scheduled)-15 mins rapid fire questions. It was a good experience Second round - zoom video call (Pre scheduled) -1 hour coding interview where neither the HR or the interviewer shared their video but asked me to share my video. HR took my consent and took a screenshot not sure why it's being used. Asked interviewer to share video but was refused with reason "Not allowed to share video and only candidate should share". Was a horrible experience as I had to talk seeing myself in a video chat but the interview was good and ok. Impression negative Third round - (unscheduled unknown caller) - calls and says he is from UST global and says need to talk few minutes. I was in a project call, excused thinking it would be a quick call. To my surprise it was a third round interview. Asked few questions, I was able to answer few not able to answer couple as I was in a different mood. Not sure if I'll be selected but my impression went from negative to worst.

3 rounds of interview.1 technical round.The First round was technical teams round.Basically the technical knowlegd assessment and the programing skill assessment through basic programing in bigdata (scala).Next round was the managerial round with client and UST,for checking the project knowledge and roles and the ability to handle the project issues, teamwork management etc.