Extremely extensive and allows you to level up and think on your feet. I had a 3-step interview process. The last two were on the same day, right after each other. Most importantly, unexpected.

Very unprofessional. I waited outside their building for 20-25 minutes until someone got me. During the interview, I felt rushed and it seemed like the person who was interviewing me just wanted me out ASAP. After the interview I was told that I would get a call back that week and never got one. Completely ghosted. It's common courtesy to let applicants know if they got the job or not.