Amazon Senior Software Development Engineer interview questions

It was a 6 sessions interview, two managers, two very experieced devs and two other devs, with an escape for lunch with a friendly manager from another team. They were two algorithm problems, three three design questions, all very interesting, the exhausting part for me was the very focused behavioral questions which sounded somehow repetitive but always different. They were are nice and friendly, overall was a great experience, I thought I did great, I was pretty disappointed I didn't get in, not by the result in itself but mostly by the fact I don't know exactly what I've done wrong.

First, you will receive a online assessment with two parts which are code debug &reasoning test. Debug is all about change one line or two to make function works. Reasoning is all about logical. Overall, it is new to me but fair enough.