Skills
What I can do — and how confident I am with it.
I only write down what I have built or run myself. No percentage self-assessments: either in a project, in production, or in preparation.
Infrastructure & operations
- Virtualisation with Proxmox (VMs, containers, snapshots, backups)Production
- Containerisation with Docker (Compose, business services, updates)Production
- Linux servers (Debian/Ubuntu, systemd, permissions, services, logs)Production
- Windows environments and Active DirectoryProduction
- NAS, storage and backup concepts incl. recovery testingProduction
Network & access
- LAN, VLAN, WLAN — setup, segmentation, troubleshootingHands-on
- VPN (site-to-site and remote access)Hands-on
- Routing and switching, firewalls — CCNA levelCourses I–III
- Running my own DNS (own resolver, filtering, analysis)Production
- Securing access: identity verification in front of services instead of open portsHands-on
Automation & monitoring
- Python for tooling, data queries and schedulesHands-on
- Bash scripts for operational and maintenance tasksHands-on
- Monitoring and alerting (metrics, thresholds, notifications)Production
- Systematic fault analysis across system layersHands-on
- Technical documentation (Jira, Confluence environment, own notes)Hands-on
Applications & development
- Point-of-sale and store system landscapes in retail (testing, analysis, rollout)Hands-on
- DATEV environment and commercial softwareHands-on
- SQL queries and database workHands-on
- VBA for automating commercial processesHands-on
- HTML, CSS, JavaScript and ASP.NET fundamentalsBasics
ProxmoxDockerLinux
WindowsActive Directory
VLANVPNDNS
PythonBashSQL
VBAMonitoringJira
Languages
- Germannative
- Englishfull professional
- Russianbasic