In my interview process, I received two phone calls from two different research scientists. Both phone calls lasted around 30 minutes. This was later followed by in person interview (about 2 weeks after the last phone call). Very friendly process all the way through. Really smart, caring, and interesting people working here. They're working on really pressing stuff, with a great team, in a great location.

Initial call with a scientist at the company, followed by a call with the hiring manager. Was then brought in for a full-day of interviews with the whole team. For the RA level, no formal presentation was required