Jarek Hartman

Linux

Linux administration, networking, firewalls and virtualization (Proxmox).

Git

Daily use for version control and collaboration with GitHub, GitLab and Gitea.

Docker

Build and ship apps as containers, including multi-stage builds for CI/CD pipelines.

Observability

Prometheus setup, alerting, exporters, and Grafana dashboards for system visibility.

Developer

Bash first, then Go and Python for automation, tooling and services.

Telco

End‑to‑end telco systems — from Core SS7 and Charging Protocols to modern 5G.

Kubernetes

Container platforms and cluster operations with production‑grade deployments and upgrades.