A computer-implemented system may include reception of a user interface package at a client device, the user interface package including layout information and a data model, the layout information conforming to a user interface model of a backend service provider and the data model conforming to a business object model of the backend service provider. The layout is rendered at the client device based on the user interface model, data input to the rendered layout at the client device is received, the data is stored at the client device in conformance with the business object model, and the data is transmitted from the client device to the backend service provider.