Apple Physical Design interview questions

Tell me about Setup and Hold Timing constraints, introduce a project you made in Lab course, implement XOR using NANDs, they also explained about the chip design process in their company, and that it is a fabless company. Static Timing Analysis was the main issue, power consumption, CMOS design and verification

There are total 4 phone interviews for this position. The hiring process was smooth, organized and conducted in a fair manner. Interviewers are nice but technical questions are a little difficult.