Applied in November and then got a final round interview in late-February. Went directly from resume review to the final round. Typical Amazon interview: 2 back-to-back 45 min interviews, one behavioral section and one technical. Asked questions completely different than outlined in the job description, almost seemed like the interview was for a different position but the interviewers dodged the question when I brought it up.

I had three rounds in total with three different engineers. They asked some standard interview questions like stress-strain curve, cantilever beam, and then some unique situational ones. Overall, the interview process was pretty challenging.