Two phone interviews, one with HR and another one technical. After that, I had a full day onsite with 4/5 interviews. By the end of the day, I just had the brain exhausted from provided examples...

phone screen with recruiter, 1-hour interview with senior-level team member, 5-hour interview with multiple team members (1-on-1 with 5 different people). The 6 1-hour interviews are all similar. No technical challenge, but you are expected to speak to your experience with application architectures and solutions.