Backend

Reddit API

Reddit API is a RESTful API and therefore it returns JSON strings when it is called. This "backend" is offered by Reddit itself and thus does not require any resources or server-side work to maintain or use, its methods only have to be called from somewhere in order to interact with Reddit.

Device local storage

Mobile device local storage will be most likely used, for example, to save the user's Reddit accounts on the device as well as to save and load certain other application settings. This is a good idea because the data saved is pretty small and not too special and / or important not to be saved on the device. Data saved on the device is also accessible offline and faster than querying it from somewhere else.

Database(s)