It's super chill. Of course, they'll ask you basic interview questions and all that, but they'll also ask you some silly and goofy ones too! No need to dress super formal as well, but if you still want to make a good first impression, just wear business casual.

The interview process was laid back and not super formal. Just one interview and they called back with the results exactly when they said they would. It lasted for about 30 minutes total.