Recruiter phone screen, phone interview with an engineer, a huge engineering design challenge, and an all day onsite interview panel. What a COLOSSAL MEGA waste of my time, I cannot emphasize enough how pointless this was... they required a full design review of an assembly product that you have to design several versions of a product, model in CAD, run tolerance stack up analysis, FEA, material selection, manufacturing assumptions, force balancing, etc. as if the assembly was going to be actually manufactured tomorrow. They liked my design so they brought me in. The onsite was a firing squad: they run you through absurd conceptual problems that are not based in reality and will do anything to get you in a corner. It does not matter how much work you put into the project (i went above and beyond and included all the above in a 50 pg PPT, as well as fully dimensioned 11x17 prints, hi-res renders, and 3D printed parts) but it doesn't matter, they gloss over that and WILL find the one aspect that is weakest and will press it until you don't know what more to say. They don't look for you to be a good fit they look for ANY reason at all to NOT hire you. And after all that effort they will send a general BS email, "thanks for your interest in apple but we are looking for other people". What a waste of 2 days of PTO and several nights on CAD for 2 weeks...

All interviewer are quite friendly, they asked question based on your resume, and elaborate from there, so make sure you know every single details you wrote in your resume, they asked more on behavioral question, and a few technical questions.