Amazon Software Development Engineer interview questions

The recruiter contacted me in mid-February, and scheduled phone interviews in mid-March. Phone screenings went well, and they flew me to Seattle for on-site interview in April. I met 3 engineers, 2 managers and 1 recruiter in one day, and even though I feel it works well, I get rejected in one week.

there were 2 phone screens before full day inhouse interview there were 2 phone screens before full day inhouse interview on phone : they asked data structures and problem solving questions 1. string reversal 2. binary tree 3. oops concept in house : 1. db session , asked to write outer join queries 2. design session : write a design for a bus stand 3. tricky session : they gave me a puzzle - related to cryptography keys 4. find least common ancestors in a binary tree