One phone interview, 1 hour, algorithmic questions, using Google docs. 5 on-site interviews, all on the same day. Questions such as image quantization, skip lists, reordering a binary tree, implementing a reentrant lock with non-reentrant locks, scaling a system. All including whiteboard coding. Travel costs were reimbursed. Overall a very interesting experience. The only negative was the long drawn out process (3 months).