The process has 5 phases. First there is a short debugging quiz. This test asks you to look for simple bugs in relatively short functions. Next is a technical phone screen with a recruiter. It seems like the recruiter has a list of questions with expected answers and grades you based on that. The third phase is a phone interview with an engineer who asks you standard questions about your background and experience as well as more in-depth technical questions related to the job. The fourth phase is a 6-hour programming challenge. I can't go into the details of it, but I can say that it seemed like an appropriate level of difficulty considering the role I was applying for and my experience level. Unfortunately I did not have enough time to finish the project to their standards (mostly due to poor time management; I was close) and I did not advance to the final phase, which is an on-site interview.