I applied online. The process took 2 months. I interviewed at City Year (Boston, MA) in May 2016
Interview
It was a very pleasant, albeit cordial in person interview. It lasted an hour and it was a series of 18 questions. The interviewer was incredibly polite and thanked me for every answer after he was finished recording my response. Each response is typed as you write but it didn't feel awkward.
I applied online. The process took 2 weeks. I interviewed at City Year (Miami, FL) in Jul 2012
Interview
I had two interviews where they asked about my experience, what I knew about City Year/AmeriCorps and how my skills/experience made me the best candidate for the position. Their biggest concern was that since I had more of a communications background, I wouldn't enjoy the administrative aspect of the Admissions Manager role. They asked a lot of questions to make sure I would enjoy getting applicants through the admissions pipeline.
Heavily relied on performance as a corps member. Application had a few essay style questions, and the interview was fairly standard. Was supported through the process as a Corps Member applying to come back.