3 rounds: Phone screen, Technical Phone Interview, On-site Technical interviews.
There is also a code test that needs to be completed in 120 minutes and contains 3 problems. The main thing you need to keep in mind throughout the test is to be aware of the clock.
The on-site interview consisted of 5 1-hour interviews with one person each.
3 developers (Mainly algorithmic), an engineering manager (Behavioral) and a Principal Software Developer / Architect (System design).
The experience as a whole was great and very smooth.
The recruiter was extremely helpful throughout the whole process. The interviewers were very professional and helpful. ie: No tricky questions or gotchas.