03/2013 | - | Deutsche Bank AG, Frankfurt am Main - Infrastructure Systems Design | |
| 01/2011 | - | 02/2013 | Sabbatical |
| 08/1999 | - | 01/2011 | aksl AG, Frankfurt am Main - Vorstand/CTO |
| 06/2001 | - | 06/2010 | aksl Internet Services GmbH, Marburg an der Lahn - Geschäftsführer/CTO |
| 12/1996 | - | 08/1999 | FiSH Systemtechnik GmbH, Duisburg - freier IT-Architect/Consultant |
| 07/1996 | - | 08/1999 | Laufenberg GmbH, Bochum - freier IT-Architect/Consultant |
| 04/1993 | - | 07/1996 | Gellrich GmbH, Bochum - freier Consultant Operating/Support |
| 08/1991 | - | 06/1992 | Neurotech GmbH, Duisburg - freier Software-Developer |
| 08/1991 | - | 11/1991 | Neurovision GmbH, Duisburg - freier Software-Developer |
| 01/1991 | - | 03/1994 | Contega Bautechnik GmbH, Oberhausen - freier Software-Developer |
| 01/1991 | Beginn der Selbständigkeit |