Architekturdesign, Entwurfstechniken (UML, OMT, Booch, CommonKADS, EER, MDA, Patterns, Design by Contract), Performance-Tuning Java, Ruby, Groovy, C++, C, C#, Python, Perl, Pascal, Smalltalk, ML, Haskel PostgreSQL, MS-SQL, mySQL, ObjectStore PSE Pro Orion, Apache Jakarta-Tomcat, Apache Geronimo, JOnAS, Oracle Application Server, BEA Web Logic, IBM WebSphere, CORBA MICO, ORBacus, WebObjects JCreator, Visual Studio .NET / C++, Oracle JDeveloper, Borland JBuilder / Visual C++ CVS, Visual SourceSafe Mule, XFire, Spring+Hibernate, Apache (Agila [Active Developer], Ode, Maven, Ant, ServiceMix, Synapse, Jetspeed, Pluto, Xalan, Xerces, FOP, Slide, Tomcat, OJB, Axis, WSIF, Struts, Avalon, Cocoon, Lucene etc.), Twister [Active Developer/Committer], JUnit, DBUnit, JMock, JAXB, XStream, JDOM/DOM4J, Castor, OpenCMS, Compiere, OpenGL GLUT, Mesa, MS Office, MS Project, MS Visio, XML Spy, HomeSite, PL/SQL Developer, Rational Rose, ArgoUML, Poseidon Windows NT/2000/XP, Unix, Linux, Solaris