I can't divulge too much, but I applied at a career fair that the company was at. I submitted a resume, was then asked to do an online test, and then a phone interview. Lastly, I went onsite for an interview. It involved a lot of technical/math questions, and behavioral questions. Be prepared to do math and code / write algorithms.

First a 15-min talk with an engineer, brief introduction. Then online test. Next one-hour phone interview. Finally onsite interview. I got through phone interview and was invited to onsite. However I was told later that this position has already been filled.