I applied online. The process took 3 days. I interviewed at UCLA in Sept 2015
Interview
I only had a skype interview, which was pretty easy. The PI asked what I did during my PhD, most challenging stuff. Whether I did the research independently? He explained a lot on his own research. He did contact all the references I provided. Got the offer the next day
Interview questions [1]
Question 1
What is the most challenging thing you have ever encountered? How did you solve it?
In person interview was formal, with an emphasis on technical questions. The hiring decision was made based upon recommendation letters, personal interviews, and an overall acceptance by the group I was going to work in. In general, it was a pretty standard postdoc interview process. I think anybody interviewing here should prepare for many questions about their prior research.