Amazon Software Development Engineer interview questions

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I gave a recruiter my resume at my university's career fair and got an email about 2 weeks later inviting me to an on-site interview in Seattle. I was really surprised that I didn't have any phone interviews, not even an initial phone screen before being invited on-site (nobody from Amazon called me at all). I live in California, so going to the campus wasn't just a drive away. At my on-site interview, we were put into groups of 3 to complete a mini programming project that was supposedly based on problems that real Amazon engineers consider (but to a much smaller scale). Each project is independently done. That's what we worked on for the whole day, and throughout the day, you would get pulled out for short interviews mostly explaining what you're doing on the project and related things. Nothing really behavioral or technical. The interviewers were friendly and helpful. Afterwards, all the interviewees went into a room for some panel discussion and questions. Overall, I had a good experience on-site, but it was very different from what I expected or have experienced before. One thing though, it's been over a month since I submitted my reimbursements and still haven't gotten a reimbursement or update.