There was a preliminary interview at my college where I was asked a question about how to find two numbers that summed up to an input number given an unsorted array of numbers. After I passed that I got to spend some time talking to the interviewer about the company. I later received a final follow up interview onsite. I flew out to their location and spent about 8 hours on site total being introduced to the company, eating, and interviewing. The interview portion was 4 hours long with each hour allocated to a different interviewer. There were two technical interviews and two behavioral interviews.