The HR person contacted me on linkedin and then called me to talk about experience, salary, relocation and basically tell me how great Amazon is as a place to work. The phone screen consisted of an introduction and two questions. The first, a simple question about binary trees. The second a live coding session where the interviewer watched me as I typed code for a more complex string algorithm. I was then asked about the time complexity and also to improve the time complexity by further optimizing and re-coding my algorithm. It last 45 minutes total. I was given positive feedback the next day via email. I was given flights at my convenience, a super nice hotel, and $80/day to use on taxis to navigate Seattle. The on-site interview consisted of 5 rounds. The first an OOP design on the whiteboard and then further extrapolating the design as complexities were added. The second a fairly simple binary tree algorithm question on the whiteboard with time complexity analyzed. The third lunch with the manager talking about my past experience and leadership principles. The fourth (bar-raiser) a more complex binary tree algorithm question on the whiteboard that required the use of other data structures (hashtable) to further optimize it. The fifth a discussion about software testing and bug-fixing. I was given positive feedback that same day 2 hours after interview.