Initial communication was an email from the hiring manager. This was followed by a phone interview that lasted about 1 hour. A number of basic engineering questions were asked like to describe a monotonic stress-strain curve. A week or so after the phone interview I was invited for an on-site interview. That was INTENSE. Several 1:1 sessions with managers, a presentation to a large group, lunch with the group I'd be working with, then more 1:1 sessions with managers. Took pretty much all day. After the onsite interview it was a couple weeks until I got a phone call with a verbal offer which was followed up later that same day with a written offer.