The interview process can be broken down into to main groups, the first being Android in general with questions of type like lifecycles, Kotlin, SOLID, sealed classes, data classes, threading, concurrency, hashing, data structures, etc. The second one is technical where you will be given actual tasks. Use the HackerRank to prepare for the interview, helped me a lot. Also the more you familiarise yourself with the platform the better for you, as the actual interview is mostly done on HackerRank.