I was contacted by amazon about half a year after I applied. I did the online assessment, a phone/video screening, and an all day in person interview. The interview on site was the hardest. 4 of the 5 interviews were technical and one was behavioral. I signed an NDA so I won't give specific questions, but I will tell you what I did to prepare. I read through the entire Cracking the Coding Interview book (I didn't have time to do all the problems but I made sure I understood the answers). I took the Algorithms class on coursera (they offer two sequential classes). That was probably one of the most helpful things. Those classes go over exactly what you need to know - data structures, algorithms, etc. They didn't ask me directly about the data structures (i.e. What is a hash table?) but I did need to know exactly what my options were and the properties of each data structure. For each problem, I had to choose which structures were appropriate and explain why. So I had to know them inside and out. I would strongly recommend going through all the common data structures and refreshing how they work, what they are best for, and the complexity of each operation. I would also suggest learning about Amazon specifically - what their teams do, what languages and database systems they use. I did, so I was able to ask my interviewers good questions. During the interview, I was extremely nervous but I made sure to talk through everything I was doing and thinking about even if I didn't have a solution in mind right away. I recommend trying to minimize silent moments.