I have worked systematically and intensively with subsequent software products, solutions and environments :

DevOps

Automatisation of deployments and administration in heterogenous it landscapes is one of my strongest skills.
Continous integration and Continous deployments with Gitlab
ansible, yaml, jinja2
Docker, docker-swarm, docker-compose, podman, kubernetes

SAP Administration

The field of activity of most of my projects has been administration of SAP systems. The range of activities are multi-faceted, beginning with design of SAP System and IT landscapes, managing and implementation of IT projects, finally documentation of solutions and of course training of employees, until it is handed over to production.
SAP performance analysis
SAP Netweaver 2004, 7.x: administration
SAP transport management
SAP consolidations and OS/DB migrations
SAP upgrades, enhancement package implementations
Backup & Desaster Recovery, high availability solutions in SAP landscapes
Administration: SAP BI, SAP CRM, Netweaver PI, Netweaver CE, Development Infrastructure Systems
Administration of SAP host agents, SAP diagnostics Agents, Wily Enterprise Manager

SAP Solution Manager

A significant extent of my activities comprise SAP Solution Manager installations and implementations of it's modules:
Change Request Management
Monitoring with CCMS, and Monitoring Alerting Infrastructure (MAI)
ITSM - Service Desk
Solution Documentation

Other (Non-SAP) Applications

By implementation of many projects in financial services area I was able to develop specialized expertise:
OBS (Online Banking System) - developed by company Die Software Peter Fitzon GmbH
BAFin Anwendung der secunet AG, nach KWG §24c
IBM WebSphere Application Server v5 (Base, Network Deployment)
IBM WebSphere MQ v5.3 (MQ Series)
IBM Tivoli Storage Manager, IM Tivoli Data Protection for SAP, IBM Tivoli Data Protection for Oracle

Operating Systems

IBM AIX
Linux (Suse, RedHat)
Microsoft Windows

Programming Languages

Python
Microsoft Powershell
UNIX Shell programming (ksh, bash and csh), Perl, awk, sed
Microsoft VBA, especially programming of Microsoft Access databases
SQL, Oracle PL/SQL
HTML5, CSS
Java (including Adroid App Development, C# (including WPF, WCF, XAML, Windows Store App Development, LINQ)