I applied online. I interviewed at University of Colorado Boulder
Interview
I had an interview on Skype and then was flown in for an in-person interview which lasted for a day. I gave a research presentation and had the opportunity to meet everyone from the lab as well as some faculty members.
Talk/Presentation to full room of scientists and students along with individual interviews by staff followed by tour of facilities. Tiring long day followed by interview session with faculty at the end of the day.