For non-disclosure reasons, I cannot publish customer and project details on my public website. Therefore, I am only quoting some keywords I have dealt with.
The following lists are incomplete, but sorted alphabetically.
If you are interested in a cooperation, I will be happy to share selected references, e.g. CV, letters of recommendation, certificates and work samples.
Tasks
Application Migration, Expense estimate, Balance sheet entry, Call center, Data analysis and design, Database development, Data Modeling, Embedded development / hardware-related development, Development management, Creation of programming specifications, ETL, Author of specialist books, Major project management, Hardware selection, Hardware purchase, IT architecture, IT consulting, IT project management, IT strategy consulting, Capacity Planning, Knowledge Management, Linux development, Linux Introduction, Methods of agile software development (Kanban), Network administration, Operation Center, Personnel development, Portal operation, Project management Project team building / development, Service Management, Software development, Software packaging (Debian, RPM), Systems Management, Team leader (IT), Technical process planning, Technical editor, Technology assessment, Technology study, Test automation, Tool evaluation, Troubleshooting, Version control systems, Distribution, Virtualization, Merchandise management system, …
Programming languages
Assembler (DEC, intel), Basic, C, Clipper, COMAL, Delphi, Fortran, JavaScript, Make, Machine languages / MicroController programming, Modula-2, Pascal, Perl, PHP, Prolog, Rexx/2, Smalltalk, SQL, TeX/LaTeX, UNIX shell script (bash,…), xbase, …
Operating Systems
Digital Research CP/M, HP Unix, IBM AIX, IBM OS/2, Linux (Debian, RHEL, SLES, OpenSuSE, CentOS, Ubuntu, …), MacOS, Microsoft DOS, Microsoft Windows, Novell Netware, Sun Solaris, VMware ESXi, …
Database Management Systems
Ashton Tate dBase, Borland Paradox, IBM DB2 / UDB, Microsoft SQL-Server, MySQL Server, Novell BTrieve, Oracle Database Server, …
OpenSource tools
Amavis, Apache HTTP server, Asterisk, BackupPC, BigSister, Cacti, cvs, Cyrus IMAP server, Dante SOCKS server, Exim Mailserver, fetchmail, FreeRadius, git, Heartbeat (Linux clustering), iptables, ISC BIND (DNS server), ISC DHCP server, Jenkins CI, MRTG, Nagios (Monitoring Framework), OpenLDAP Server, OpenSSH, PhpMyAdmin, Postfix, rcs, rsync, Samba, SOGO (groupware), Spamassassin, Squid (proxy server), Strongswan ipsec VPN, Subversion, Tcpdump, Tomcat, vim, Wireshark, x3270, xen, xntpd, …
Commercial products
BMC Action Request System (Remedy ARS), BMC Atrium CMDB, BMC Discovery (ADDM), CBR Express, Checkpoint Firewall 1, Citrix Access Gateway, HP Service Manager, IBM Connect: Direct, IBM HTTP Server (IHS), IBM Lotus Notes, IBM pComm, IBM WebSphere Application Server, IBM WebSphere MQ, k-Commerce, Lucent VitalQIP, Men&Mice Enterprise Suite, Microsoft Cluster Server, Microsoft DNS Server, Microsoft Project, Microsoft SQL Server Reporting Services (SSRS), Novell GroupWise, Oracle WebLogic Server, Reuters, SAP Business Objects, Sunlink SNA Gateway, VMware vSphere, Xentrik broker, Xetra, Xontro, …
Network protocols
3270 terminal, Webserver, Mailserver, BBS, CGI scripts, Cluster, DHCP, DNS, EIB/KNX Home automation, Ethernet, File transfer, Firewalls, IMAP, ISDN, ISO/OSI, J2EE, LAN infrastructure (router, switches), LDAP, Loadbalancer, Mail, Messaging (Jabber, Mumble,…), Network Time Synchronization, Proxy server, Radius authentication server, Reverse Proxy, RFC, Smartcard authentication, SMTP, SNA, SNMP, SSL certificates, Storage Infrastructure (SAN/NAS), TCP/IP, Token ring, uucp / uucico, VNC, VoIP /SIP, VPN (ipsec, pptp), Web portals, Wiki, X11, …