This thesis describes the development of a multi-target mobile application for the document version management system eDOCS DM by utilizing an existing web service on behalf of Data Ductus. The application targets the leading mobile operating systems iOS and Android while sharing the business logic through a portable class library. The Xamarin toolchain provides the mechanics for compiling the C# codebase to run on both OSs. Furthermore the Model-View-ViewModel framework MVVMCross is tested to simplify the interface development. During the research phase two other similar frameworks are examined: PhoneGap and Appcelerator Titanium.