Betriebssysteme: Linux (Redhat, Fedora, Debian, Suse, Mandrake, Ubuntu) 32- und 64-Bit, SUN Solaris, SCO Openserver, SCO Unixware, FreeBSD, Reliant Unix (Siemens), Windows (32bit/64bit, WS: 98-Windows 7, Server: NT-2003), MacOS/iOS, Android Softwareentwicklung: Java, Javascript, C/C++/Objective C, Borland Delphi/Kylix/Pascal, Assembler (65xx, 68xxx, 860xx), Fortran, Visual Basic, Skriptsprachen (Perl, PHP, Python, Ruby), PL/SQL, Unix scripting etc Java-Technologien: AWT, SWT, Swing, JAAS-Authentifizierung, JCA (Java Cryptography Architecture), EJB WebServices (SOAP, Axis), Spring-Framework, JavaServer Faces (JSF), MyFaces, Struts 1 & 2, Apache Wicket, Enterprise Java Beans (EJB), JDBC, JDO, Hibernate, JPA, ANT, Maven, Jetspeed, AspectJ, JNI, JMS, IzPack,Visual Rules, CookXML, BadBoy, Eclipse-Plugin (Fat Client), yGuard Obfuscator, Marvin, Jakarta Commons etc. Internettechnolgie: HTTP-Server (Apache, IIS, WebSphere), NEWS-Server, Directory-Server (openLDAP), DNS, Proxy, Router, Firewalls (Cisco, FortiNet, Netgear), Mail-Server (Sendmail), Samba, NFS etc. Entwicklungstools: Eclipse/MyEclipse, Borland J-Builder, JCreator, NetBeans, SUN Java Workshop, Microsoft Visual C++, Borland C++Builder, Borland Delphi, Rational Rose, Oracle JDeveloper Middleware: Tomcat, JBoss (3-7), Geronimo, BEA Weblogic, IBM WebSphere, CORBA, RMI, Oracle-AS (OC4J), Glassfish, JOnAS, Resin, Netzwerk: TCP/IP-Netze unter Ethernet, FastEthernet, Gigaethernet, Novell, P2P, ATM, VLAN. Systemadministration Linux, Unix (SUN Solaris (Sparc, Intel), HPUX, AIX), Windows, MacOS Hardwarekenntnisse: SUN Sparc Plattform, PC-Plattform, Apple Softwaredesign: OOD, OOA (Einsatz von Rational Rose), ObjectStore RRD, UML Datenbanken: Oracle, MySQL, IBM DB/2, PostgreSQL, Interbase/Firebird, MS SQL-Server, ObjectStore, dBase, HSQLDB, Ingres, MongoDB, SAP MaxDB, SQLite Groupware-Systeme: eGroupware, OpenGroupware/Skyrix, PHPGroupware, PHProjekt, Intraline, Lotus Notes, Novell Evolution CMS-Systeme: Mambo/Joomla, OpenCMS, Typo3, PHPnuke, Postnuke, Nukes, Wordpress etc. Code-Versioning: CVS, Subversion, Visual-Sourcesafe, Clearcase, Git Build-Management: Ant, Maven, Jenkins/Hudson, Nexus etc. sonstige Tools: ER-Win, TOAD, PgAdmin, SQLDeveloper, Rational Rose, CVS, PVCS, Subversion, DataArchitect, DBDesigner, Oracle Designer etc.