A computer-implemented system may include reception, from a user interface client application, of an instruction to execute a user interface script conforming to a user interface component model, and determination of whether to execute the user interface script in the user interface client application or in a user interface backend application. If it is determined to execute the user interface script in the user interface client application, first program code associated with the user interface script is executed in the user interface client application, and if it is determined to execute the user interface script in the user interface backend application, second program code associated with the user interface script is executed in the user interface backend application.