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Portfolio

From practice: platforms, automation and software

An overview of the topics we work on every day. The screenshots come from real environments – names, addresses and customer data have been anonymised.

  • 30+Linux systems under monitoring
  • 3Proxmox nodes in the cluster
  • 90 daysof metrics and logs retained
  • 30 yearsof IT experience
Private Cloud

Container platforms in your own data centre

We plan and run virtualisation and container platforms that don’t depend on hyperscalers – from a compact Proxmox cluster to OpenShift and Kubernetes.

  • High availability with automatic failover and failback
  • ZFS replication between nodes, without shared storage
  • Unprivileged LXC with Podman as a lean standard for services
  • Migrating existing systems with seconds rather than hours of downtime
  • Proxmox
  • ZFS
  • OpenShift
  • Kubernetes
  • Podman
Field report: Proxmox HA with ZFS replication →
Grafana dashboard showing the load of a Proxmox cluster: three nodes, running guests, CPU and RAM history
Grafana – overview of a Proxmox cluster
Automation

Patch management for dozens of Linux servers

Rolling out updates without losing sleep: inventory straight from the virtualisation layer, playbooks with built-in safety nets and a UI where routine work runs with a single click.

  • Inventory generated automatically from the Proxmox API
  • Snapshot before every release upgrade
  • Post-patch checks: are all containers running, are all ports reachable?
  • Target validation in every playbook against “success without effect”
  • Ansible
  • Semaphore
  • Debian
  • Python
Seven pitfalls from day-to-day operations (German) →
Semaphore with Ansible templates for patching, release upgrades and service setup
Semaphore – Ansible templates for recurring tasks
Monitoring

Monitoring that warns you in time

A central monitoring stack collects metrics and logs from all systems, shows pending updates and bottlenecks at a glance and reports problems where they won’t be missed.

  • Pending updates, reboots and vulnerabilities per server
  • Router logs, internet quality and website availability
  • Certificate and outage alerts
  • Alerts via WhatsApp to the responsible group
  • Prometheus
  • Grafana
  • Loki
  • Uptime Kuma
Grafana patch status dashboard: all servers without pending updates, with operating system and package list age
Grafana – patch status of all servers (host names anonymised)
Network

Connecting sites securely

From the small office to the remote site: we segment networks cleanly, connect sites via VPN and make Wi-Fi measurable too.

  • VLANs and firewall rules on a “only what’s needed” basis
  • WireGuard tunnels between sites and for remote access
  • Wi-Fi monitoring for lab and school networks
  • Containers directly on the router where it makes sense
  • MikroTik
  • WireGuard
  • VLAN
  • WLAN
Grafana dashboard for the internet connection: availability, latency and packet loss
Grafana – internet connection, latency and packet loss
Software

Custom software and AI-assisted development

When off-the-shelf software doesn’t fit, we build lean applications – fast with AI assistance, production-ready from day one with CI/CD and containers.

  • Web applications for schools and administration
  • Interfaces and gateways, e.g. for notifications
  • Automatic deployment on every push
  • Development with AI assistants, responsibility with people
  • SvelteKit
  • Python
  • Go
  • PostgreSQL
  • Claude Code
Case study (German): lesson-review manager →
Thesis tracker: teacher dashboard with teams and supervised students (names anonymised)
Thesis tracker – teacher dashboard (names anonymised)
Smart Home

Controlling building systems remotely

Home Assistant as the central control for several sites – with voice control, automations and monitoring, even for houses where nobody is on site.

  • Air conditioners and sensors from different vendors in one interface
  • Matter devices at a remote site via a VPN tunnel
  • Voice control via a custom Alexa skill
  • Humidity and dew-point control against mould
  • Home Assistant
  • Matter
  • Alexa
  • Prometheus
Dew-point control with Home Assistant (German) →
Home Assistant dehumidification dashboard with humidity, dew point and air conditioners
Home Assistant – dehumidification with dew-point history
Contact

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Tell us briefly what it’s about – we’ll get back to you promptly.