Amazon Software Engineer (Embedded) interview questions

The overall interview process sucks. You directly dive into a technical interview with a software developer. It also asks you questions about leadership principles. There are no HRs in the interview. The interviewer was tired so didn't even listen to my response, said okay and switched to the technical interview. They want you to bring at least 10 stories there so you have to prepare in advance but it really doesn't matter, it depends on your luck and the day of the interviewer. I got asked a very simple technical coding question so I nailed it but I don't understand how can they ask that kind of easy technical question. Then they didn't get back to me until I asked them. They said I have been rejected and I should've received an email notification about the result but I haven't.