I had a 30-minute interview that mainly focused on unit testing and security. The interviewers were really nice.
Good luck! It's not easy to get an interview invite, so if you've made it to the interview stage, you're already 80% of the way there!
Interview questions [1]
Question 1
There were some questions about unit testing, such as what kinds of tests you've written and what tools/frameworks you've used.
They also asked about security concepts, for example how you would maintain security while still keeping up the speed of development.