EPAM Systems interview questions

First technical round was virtual it was a medium difficulty interview. Interviewer was warm and friendly. Gave enough time to think and answer the question. They interview on their own in house platform. If you are prepared you can crack. They only want quality candidates. But unfortunately HR don't reach back if you fail which is a unprofessional thing to do.

For some reason they assumed that I'm applying for a Lead position and arranged some stress interview. Or they were just impolite. Tried to ask some specific questions about my previous company and projects knowing that it's not allowed to share due to NDA.