I was invited for an in-person interview after a phone screening. Though I have been developing good tools in Python for the last 2 years in the DevOps area, one of the interviewers got me with some tricky coding exercise. The 2 guys interviewed me were cynical and I knew they were not going to recommend me no matter how I performed. I wasted about 3 hours in going down to Menlo Park for this exercise and highly regret it now. It's a disorganized place and you should consider the company only if you have no other option.