Found an ad for the company online. After checking them out, they seemed to have a pretty neat product line, so I applied. I got an e-mail asking to set up a call a week later. It was a pretty basic phone screen and we just went over my resume & the company's goals.
A few days after the first call, I had a longer call with somebody higher up. We talked for awhile about the position, some of the challenges they're facing, my experience, etc.
After that call, they flew me down to Chicago for an in-person interview. There were three 1:1 interviews, and then sort of a lightning round where a bunch of other staff came in small groups to meet & chat for 5-10 minutes.