Silverlight developer needed for a project

We need to build a prototype application that shows the understanding of MEF (Managed Extensibility Framework) Silverlight. Basically, we need to create a silverlight application that can run as a desktop application as well as web. We already created it and now we want to include MEF into it and a WCF service will need to be created that can be hosted as a standalone service without IIS. We will need to pass data between 2 windows. Our team would wok on it and we need an expert to help. Previous experience with MEF is mandatory.