I applied in-person. I interviewed at Trader Joe's (Gaithersburg, MD) in Mar 2015
Interview
I applied at the store, was a customer at the store and heard that they are hiring. Called me back in a week and then two interviews back to back with one of the mates and then the captain.
It was quick and seamless and they let me know in ample time. It was a painless process and the crew was quick to give honest opinions about working there. The Captain changed but at the time turnover wasn't high.
Interview questions [1]
Question 1
Why do you want to work at Trader Joes and do you have any favorite products.
Applied online and had one in person interview with the captain. It lasted maybe 10 minutes. Got a call a week or so later that I got the job. Very fast process.
It's two to three interviews, the final with the Captain (or highest manager) of the store. The interviews are largely to get to know your personality and how well you would do at customer service.