First of all, the app look really great, simple and efficient design. Good job guys !!
For few actions in the app, like searching, filtering, etc .. there is nothing to tell the user that something is loading. Even the native "loading" in the status bar doesn't exists.
I really love to see what's going on when I use an app, like the main things: a loading for any action.
Please, allow a loading icon somewhere everytime an action need to use the network.