Very simple. Quick virtual interview and pretty simple questions. Research their values and what not and you should be good to go. As far as I remember it was a single interview and decision is relatively soon after that.
A simple virtual interview where they ask you about your background and motivation for signing up for a year, they may give you some scenarios to see what you'd do in a classroom setting.
Interview questions [1]
Question 1
What do you plan to do with the experience you receive from your year of service?
I applied online. I interviewed at City Year (New York, NY)
Interview
I filled out the online application then I got an email, scheduling a phone interview. It lasted for almost an hour I want to say. Then I heard back within a week that I got the job. I didn't meet anyone in person until registration day, which is when they collect your identification pretty much.
Interview questions [1]
Question 1
What experience has prepared you to take on a role like this one?