Hello community,

I read almost all posts regarding Amazon or Google interview process, and I just understood that most of the people interviewed there were interviewed not for mobile positions. So I would appreciate it if you can suggest to me how to prepare for the mobile position interview, like what type of system design questions should I pay attention more, or did they ask some Android-specific questions. I would appreciate any kind of info.
And one more thing. I know that most of the positions for android devs of google are in London. But I couldn't find where the major part of amazon's mobile team is located.