Amazon Software Development Engineer-II interview questions

I applied online and was prompted to take an online code challenge after a few days. I was only allowed to use their testing site to answer the coding questions and was not allowed to consult the internet for anything. The coding challenge was set at 75 minutes and allowed me to pick between a few languages to use. None of the languages had third party libraries available to make solving the problems similar to how most do while programming on the job. There were a few days between every step of the process.

I was first contacted by a recruiter from Amazon who after asking me to complete a questionnaire. After this, the recruiter organized a technical interview by phone. A week later the recruiter contacted me again and organized another technical phone interview. After the second phone interview I was invited to fly to Seattle for on-site interviews.