Amazon Engineering Manager interview questions

This was by far the most unprofessional interview I've ever been a part of. The interviewer missed the first 1/3 of the interview by being late (and not alerting me that he would be late), but did not add on any additional time at the end. The remaining 2/3 of the interview were split between him asking me questions, and me asking him questions. He seemed genuinely uninterested in any answer I gave him, as if he had already made his decision before I even opened my mouth. Finally his answers to the questions I asked him about Amazon were lacking in any depth or insight. He really just wanted to get back to whatever it was he was doing before he was forced to call me.

1 Telecon, 4 onsite and 1 video call. Telecon is initial screening round. Also, I was asked for writing assignment to be submitted after telecon and before onsite interview.