There was no interview per se. It's best to contact a professor you know about a specific TA position. They can pull your application out of the stack and give you priority consideration for the position.
Other Graduate Teaching Assistant interview reviews for UC San Diego
I applied online. The process took 2 weeks. I interviewed at UC San Diego (San Diego, CA) in Dec 2017
Interview
English speaking test(explain a simple problem in your field ), talk with professor about your plan during your Teaching assistant time, what is your way to contribute to the class
I applied online. I interviewed at UC San Diego (San Diego, CA) in May 2016
Interview
Applied online, was emailed for an interview. I had worked with some of the folks in this department beforehand and they knew I was applying. I got an offer on the spot, it was a good day.
Interview questions [1]
Question 1
How would you handle a student that didn't want to historically analyze Christian holy texts?