It was a pretty straight forward process: 1) Recruiter screen, 2) Hiring manager interview, 3) panel with the designers on staff, 4) interview with senior engineering manager and manager of technical product.
It was honestly one of the best interview experience I've had. Everyone did their homework and knew about my experience and had checked out my portfolio and were able to speak to it and we had some great conversations about it. They weren't expecting candidates to complete a design challenge or a portfolio review which I loved. Everyone I spoke to was kind, interested, and seemed very intelligent and capable.
On top of that, the recruiter was great! He was constantly in contact with me and didn't keep me guessing and answered all of my questions.