Amazon Software Development Engineer interview questions

Got call from HR for hiring event. 1st hackerrank coding test for 90 mins. Code, Complexity and Unit test cases for getting some info & ordering it from direct friends in social network (gave helper functions). Next HR feedback call which surprisingly had some technical q&a like data structures insertion deletion complexity. Next was 4 rounds in-person. I think I gave a less optimal, round-about solution in the last round. Also every round had lots of behavioral questions. Everyone was very pleasant and helpful.