Good interviews will be focused on things you've actually done with the tech along with common knowledge items that show you've used them.
Past that lots of places like to talk general programming questions for the technical bits, so be prepared for stuff that might be a bit outside your normal day to day work like data structures/algorithms you don't have to think about in lots of langs.
Personally for an interview I just prepare myself to think clearly under pressure. The best interviews involve actually doing something, whether it be whiteboarding your thought process through an algorithm or actually writing some code. Just relax and focus.