Systems and techniques for application development performed independently of system landscape. In one general aspect, the invention provides a computer-implemented method that includes receiving, from a registry for two or more repositories, information describing an object definition of a first repository of the two or more repositories. The first repository is a collection of object definitions associated with a first application. The method includes using the information to generate a proxy for the object definition and storing the proxy in a second repository of the two or more repositories. The proxy is a reference to the object definition of the first repository. The second repository is a collection of definitions associated with a second application. Wherein the proxy is available to the second application for use as though the proxy is an object definition of the second repository.