About
I'm Tuomas Tielinen, a Systems Architect with over 15 years of experience building and operating IT platforms. My focus has been on applying Cloud Architecture principles to design scalable, resilient and secure infrastructures — bridging the gap between complex on-premise environments and modern cloud-native solutions. In practice that has ranged from maintaining a mission-critical core banking platform (Temenos T24) under a 24/7 on-call rota, to operating a multi-cluster OpenShift environment — and its Ceph storage — in a private data centre.
Focus areas
Container Orchestration — OpenShift and Kubernetes. In my most recent role I operated a multi-cluster OpenShift platform — separate development, production and management clusters — in a private data centre, including the underlying Ceph storage. I supported the developers building on the platform and helped migrate their applications from OpenShift 3 to OpenShift 4. That experience is also why the homelab documented here deliberately doesn't run Kubernetes — the reasoning is written up in full, including what running Quadlets instead gives up. Knowing when a platform isn't warranted is part of knowing the platform.
Automation & GitOps — building GitLab CI/CD pipelines together with development teams, day-to-day GitOps with ArgoCD, and managing RHEL fleets with Ansible. The Infrastructure section of this site shows the same Ansible-first approach at homelab scale.
Security & Observability — installing, configuring and maintaining Red Hat Advanced Cluster Security (RHACS), and wiring security scanning into the CI/CD pipelines. On the observability side: Prometheus + Alertmanager + Grafana across both professional and personal projects, plus the Elastic Stack in professional roles. The Monitoring page documents the homelab equivalent.
Current focus
Continuing to bridge hybrid environments by expanding my public-cloud expertise — I passed the AWS Certified Solutions Architect – Associate (SAA-C03) certification in August 2026.
Why a homelab
I'm a deeply hands-on architect: design decisions should be grounded in practical reality, not slides. The homelab documented here is where I stay sharp on the tools I have worked with — Proxmox, Ansible, Podman/Quadlets, the Prometheus stack — and where I explore newer interests like local, privacy-focused AI (Ollama, Qdrant). The architectural decisions here are written up the way I'd argue them in a design review: the trade-off stated, the reasoning shown, and the places a choice falls short named rather than left out. The conclusions are sized for one flat and one person — several of them would be wrong in production — but the way of arriving at them is what transfers.
Contact
Privacy
This site uses Cloudflare Web Analytics, which is cookieless and collects no personal data — so there's no consent banner to click through. No other trackers run on these pages.