Apple

40 minutes tops. Very little in-depth discussion of the actual job to be done. The interviewers were there as a group to interview a number of candidates to take on as a small group.

The interviews are known to be mostly hard, but it turns out if you prepare enough, it is not that difficult. I think communication is the key in the interview process.

5-6 technical rounds. With a screening. All rounds would include coding and design-based questions. Along with those, expect questions on the basics of RTOS, computer architecture, and C, as well as embedded core kernel-based questions.