After a brief "get-to-know-you" type of interview, you will be given a lab to complete using AppDynamics. Everything you need for the lab is in the cloud, and you will be given pretty detailed instructions on how to get started. The lab isn't easy, but it also isn't incredibly hard. You will be given plenty of time to complete it and can do so when you have time to fit it in.
Assuming you do well with the lab, you will meet with a team to do an in-person demonstration of something of your choosing. Chose wisely as you are definitely being tested to see how well you can answer questions about your topic.