Amazon Sr Software Engineer interview questions

I was contacted by Amazon.com recruiter, and decided to speak to him out of curiosity (I already had a job and was happy there). There was no phone interview per se, in person interview look was quickly arranged. I had five 1:1 interviews, one of which was a lunch where I was the one asking questions. Of course, they all count, no matter if I am answering or asking questions. Each of the other four interviews included a programming question, and having read GlassDoor reviews in advance, I knew almost all would include some sort of hash table. Two were developers, three were managers. I received a call the next day that they would extend the offer. But I did not receive the offer for three weeks. When I did, it was not to my satisfaction. Attempt to negotiate was not successful, so I declined.