After talking to them at the career fair, I received a text later that day asking if I would be available for an interview with the person I spoke with in the following days. The interview was 30 minutes long, with about 20-25 minutes dedicated to the interviewer asking questions.

After that, I had two phone interviews with interested managers at Apple, spaced about a week apart. During these phone interviews, it pretty much consisted of me explaining my resume and what I've accomplished. Typically, they were interested in a specific part of my experience and wanted to discuss it further.

In my opinion, if you make it past the first technical interview, you are likely to be hired. The subsequent phone interviews seem to be primarily for placement purposes, as long as you can confidently discuss the content of your resume.

Material properties, structures, beam bending in the first interview.