Starts with a phone screen from a recruiter that's super casual, just getting to know each other. Had another phone screen with an engineer where I solved a coding problem in Swift. Was fairly easy but only because I had prepared well. After that I was invited on site. First half of the day onsite is spent working on a sample project. You then walk through the app with a panel of engineers as they ask you questions about your design choices. After you'll have a few one on ones that range from run of the mill behavioral questions to some light iOS white-boarding.