Hitachi Vantara Software Developer interview questions

It was a good interview with dsa and oops and sql based questions. For a trainee position the interview was medium but they didnt send the offer letter even after selection. Theb after a lot of time i received the offer without any communication

First had a recruiter call, then had a call with the HM. Then tech screen. Then onsite interview 1, onsite interview 2, onsite interview 3, onsite interview 4 and onsite interview 5.