First I had to a phone screen where we discussed several questions about Objective C: memory management KVO, KVC, Core Data... If you pass this interview, they will bring you on site and you will have a series of interviews (4 for me). 3 of them were engineering related, with whiteboard coding problems. The current office is pretty crowded and everything looked a little messy, but they told me they are about to move to their new shiny office, so I expect that to change soon enough.