A manager came to our school to recruit graduate students for the process engineer position. I submitted my resume and got emailed about a 30-minute interview the next day. At the end of the interview, I was told I am going onsite. I came onsite a month later for whole day one-on-one interviews with an hour allotted for dissertation presentation. I honestly think this was among the easy interviews I had - almost no technical question, mostly about my work and experience with some behavioral questions. There was only one interviewer I remember that gave me "puzzles" to solve, but it was real life problems in the Intel fab. I was told that employees are expected to work ~60hrs/week with week-long on call rotations. Lunch with two of the employees gave me a chance to ask a lot of questions on how it's like working with Intel - they were very helpful. One of them told me that he really likes working there (coming in at 6am, having a long lunch and leaving at 5 is what he said). The other was transferred from another location and position, and told me that the previous position (design) was more enjoyable.

Process begins with a phone screen with recruiter, followed by hiring manager discussion, then onsite interviews consisting of several one-on-one sessions, where candidates are usually expected to deliver a presentation.