I applied online. The process took 2 months. I interviewed at Argonne National Laboratory (Lemont, IL)
Interview
Initial phone screening/interview plus full-day onsite interview requiring a presentation. Understand the position your applying to and the landscape of your division. An administrative assistant should be providing you with a list of people that are interviewing you. You should be familiar with what each person on the list does before you get there. I recommend to go as far as to read the interviewers papers.
I applied through an employee referral. The process took 1 day. I interviewed at Argonne National Laboratory (Lemont, IL) in Dec 2016
Interview
Had a phone chat first (kind of informal), then came on-site, met all the group members including 4 staff and 3 fellow postdocs (each one around half hour) and gave a 1-hour seminar
Interview questions [1]
Question 1
What is your career goal and how this position could help you.