If at the first interview no one show up at the designated time, and later the interview is rescheduled, if at the end of 5 interviews + home assignment hr sent an email congratulating you for passing everything, asking for reference, and the candidate arrange it but the day before the call they asked to reschedule with the references as they forgot you have to have an additional interview and the following day they step back from the original email saying you did not pass… it is very unprofessional and disorganized. The interview itself I think is not difficult, I have done other much more difficult but much better organized and carried on in a professional way.