A system, method, and tangible medium to build a user interface, the system including a backend system supporting processing and persisting of a parameter model defining a user interface, the parameter model specifying user input fields of the user interface to be defined; a user interface framework to render the parameter model to solicit at least one input value for the input fields of the user interface from a user; and a service, distinct from the user interface framework and the backend system, to deliver the parameter model to the user interface framework, the service further to persist the at least one input value from the user.