3 phone interviews (1 technical) and onsite interviews with 5 rounds of interviewers from managers to directors. A final behavioral interview with an hr rep completed the process. Questions varied from 'Why do you want to work for Quantcast" to "How would you solve this current problem we have?". Started with lunch and meeting a member of the department I would be in and transitioned into either 1:1 or 2:1 interviewing. Three of my interviewers asked generic algorithm questions that I had to write solutions for on a white board with them.