Apple Product Design Engineer interview questions

They really make you earn the job. I was contacted by a recruiter by email. Then we had a phone interview going over the basics and where they gave me an idea of what to expect from my technical interview, design project, and design review/ presentation. Then in the technical interview, they asked mechanical engineering principle basics like stress, beam bending, and more random questions to see how I would approach problems that I didn't already know the answer for. In the design challenge, it's the standard prompt of redesigning a battery powered nano's back. This took forever and they usually give you a week so budget 20 weeks for it. Then came time for the review of your design with like five or so engineers. You had to make a presentation to submit your design and you pretty much just go through the presentation and then do q&a afterwards. Then they have you go through several rounds of interviews with managers, EPMs, other engineers asking you more design questions, materials questions, behavorial questions, etc.