During this time he has worked with both Java EE and Microsoft .NET. Four years ago, Arjen started to specialise in Web Services and Service Oriented Architectures. During this period, he has worked for some of the largest organizations in the world helping them better understand enterprise Java and how SOAs fit into their organizations. In part from his experiences with these organizations, Arjen founded the open source Spring Web Services project and continues to lead the technical direction and development as the project lead for Spring Web Services. This project aims at facilitating development of document-driven web services. He currently works on the REST features in Spring 3.0.