Implementations of the present disclosure include actions of transmitting a first user interface engine (UIE) to a first computing device, the first UIE being specific to a first operating system of the first computing device, transmitting a second UIE to a second computing device, the second UIE being specific to a second operating system of the second computing device, the first operating system being different from the second operating system, and transmitting one or more templates to the first computing device and the second computing device, the one or more templates being agnostic to the first operating system and the second operating system, each of the one or more templates being processable using the first UIE and the second UIE to display a first user interface and a second user interface on the first mobile device and the second mobile device, respectively.