Amazon Machine Learning Scientist interview questions

I had two phone interviews, each lasted for about an hour. What I have seen Amazon do differently than other companies (and I like that) is that they go deep, during the interview, into the projects you mention in your CV. So, technical questions pop-up as you describe one of your projects. For example, You: I used this objective function and method X to minimize it. Interviewer: ok, so why is method X well suited for this, did you try Y? I know that implementing X has the following issues, and what are your assumptions for the model You: The model is blah blah because blah blah and this is non-convex etc etc, and we try to come around this by doing .....we test it like....(they ask a lot on how to test things) There was also a programming part (machine learning related problem) and SQL. Can ask you something a bit more specific depending what you put on your CV or the role (Spark, GPU, or whatever you roll with).

Pre-screen with hiring manager who found me on LinkedIn. Two phone screens, then on-site with job talk. I was surprised that I didn't pass the first phone screen. The interviewer was friendly, professional, and very knowledgeable. The overall process was pretty slow-- slow to schedule, then slow to tell me I hadn't passed.