Programming languages / development:
Perl
Shell-Script
PHP
C++
Pascal
Modula 2
Java Script
Eclipse

Operating systems:                 
Linux (Debian and Debian-based, Redhat, SuSE)
Solaris 8/9/10
HP-UX 10.x/11.x
AIX 5.x/6.x/7.x
Windows NT / 2000 / 2003 / 2008 / 2012
MacOS ( 9 / X )
 
Databases:                             
MySQL
Oracle
MS SQL
 
Network/communication:         
TCP/IP, IPv4, IPv6
NFS, NIS, NTP
DNS, DNSSec
Cisco PIX, ASA, Router
ISDN, xDSL
LAN, WLAN, WAN
Mobile (GPRS, UMTS 3G, LTE 4G)
HTML / XML
ssh / SSL
 
Software:                                
Open Source in general
OpenSSH, OpenSSL
Sterling Connect:Direct
Sterling Connect:Enterprise
ConnectControlCenter (now IBM ControlCenter)
Sterling Integrator (now IBM FileGateway)
proftpd
Legato Networker 5.x / 6.x
Symantec BackupExec
Veritas Cluster, Microsoft Cluster
Microsoft Exchange 5.5 / 2000 / 2003
Microsoft Always On VPN
Apache
Postfix, exim, Sendmail
bullsoft Netwall 3.x/4.x
Checkpoint Firewall-1
USR (3Com) Total Control
Netscape Web/Mail Server
Albis
Cisco ESA, Ironport

Workscope:                             
conception, system consulting
problem analysis and solution design
project lead
administration
programming                                                    
high availability and critical infrastructures
managed filetransfer
process design and optimization
 
Certificates:                             
Microsoft Cluster Specialist
Legato Certified Specialist Network Protection
 

Westdeutscher Rundfunk
Equens Worldline
Commerzbank AG
Vodafone D2
Deutsche Bahn
QSC
Basell
 

from 1st January 2020 in Europe