He is working for Sun Microsystems in the StarOffice group for 10 years. He was deeply involved in the development of the UNO component model which is the foundation for the OpenOffice.org/StarOffice API. The OpenOffice.org community is one aspect of his daily work. He is involved in the OpenOffice.org project since the beginning, he is the project lead of the OpenOffice.org API project and the co-lead of the Extensions and ODF Toolkit project. His main goal is to spread the knowledge around the programmability features of OpenOffice.org around the world and to show that it is more than only an office productivity suite.

Jügen speaks frequently about the programmability features of OpenOffice.org. Some examples are the OpenOffice conferences, JAX 2003 (Germany), OOP 2004 in Munich (Germany) and JavaPolis 2006 in Antwerpen (Belgium), Jazoon 2007 in Zurich (Switzerland), JavaOne 2003 and 2007 in San Francisco (USA) and FOSS.in 2007 in Bangalore (India).