We are looking for a candidate with strong object-oriented programming and design patterns knowledge in Java, who has experience implementing multi-threaded client-server or distributed applications, that runs on various operating systems, including Unix (AIX, HP-UX) and Linux (RedHat Enterprise Linux, SuSe). The candidate will maintain and develop new features of an integration broker system, which integrates applications by converting messages between different business formats. The candidate should have knowledge on XML-related technologies, including schema validation, formatting with JAXB, XML transformation using XSLT. Basic shell scripting and SQL knowledge are required for maintenance purposes. The system is running in an OSGI container and some of the client applications are implemented as Eclipse plugins. Public key infrastructure is a must for security. SAP administration experience and knowledge on parser generators with ANTLR, JMS and enterprise integration patterns would be a plus.