The interviewing process consisted of 3 stages: - Test on a web platform - Technical Android interview with an interviewer - System Design interview, where (surprise-surprise) a *backend* system had to be designed, including covering all backend-specific technologies and approaches. Android technologies weren't in the scope of this interview. The interviewer confirmed this is a usual thing and many people are confused during the actual interview. So there was not mistake. This last peculiarity wasn't mentioned before the interview.

Four very challenging stages in all, but you'll be guided. The System Design bit posed quite a challenge because it's a bit open-ended, and interviewers try to get a feel for your approach to solving problems. Also, a rigorous technical interview for the Android stack tailored towards what you'll use on the job.