The interview process consisted of two phone calls (one interview and one call back interview), and the interviewer was a senior engineer on the team. Sometimes it is the lead engineer, but in my case he was busy.

Very quick and easy process, two rounds. Both focused unexpectedly only mainly on grilling my resume and verifying I actually knew what I was talking about in regards to engineering processes/etc. Just review engineering fundamentals and know your projects well for internship. Took less then a month total.