Apple Product Design Engineer interview questions

Challenging and drawn out interview process. Started with initial phone screen with recruiter followed by 3 technical phone interviews. Was given a design challenge and presented to PD team at Apple. Following presentation, 8 interviews 1:1 with engineers on the team. Each with a challenge question/topic.

There were three phone screens and then an on-site interview. Questions weren't that hard. The group design review is extremely difficult. If you can get friends to review your design of something. Have them interrupt you, graph stuff, question you, etc.