Tomáš Moždřeň
IT Systems Administrator & Home Lab Enthusiast
Czech Republic 🇨🇿
About
IT Systems Administrator currently working at ČEZ Distribuce, maintaining enterprise systems running the Apache Big Data stack (Hadoop, Kafka, Ozone, etc.) on RHEL 9. Responsible for system maintenance, infrastructure automation with Ansible, user support, and troubleshooting in a corporate environment.
Outside of work, I maintain a Proxmox-based home lab with ZFS storage, GPU passthrough, and containerized services. I build efficient, maintainable systems - from enterprise deployments to custom C utilities - and try to keep overhead low and reliability high.
Experience
-
Analytics and Data Platforms Specialist-ČEZ Distribuce
2025 - Present
Maintaining Apache Big Data stack (Hadoop, Kafka, Ozone) on RHEL 9, Ansible automation, user support.
Technical Skills
Virtualization & Infrastructure
- Proxmox VE
- ZFS (pools, ARC tuning, mirrored setups)
- Docker & LXC containers
- KVM/QEMU
- Ansible
Linux Administration
- RHEL 9 / CentOS
- Debian / LMDE / Ubuntu Server
- systemd & crontab automation
- Samba file sharing
- Networking (firewall, DNS, VLANs)
Big Data & Enterprise
- Apache Hadoop
- Apache Kafka
- Apache Ozone
Self-Hosted Services
- Nextcloud
- Jellyfin / Plex
- Wiki.js
- Navidrome
- Home Assistant
- Ollama (local LLMs)
Programming & Scripting
- Bash / Shell scripting
- Python
- C (system utilities)
- SQL
- Git
Languages
- Czech (native)
- English (fluent)
Projects
Featured Project
Xylonic - Subsonic Music Player
v26.09.20 · MIT License · TypeScript / Electron 27 / React 18 / Vite 8
A modern, beautiful music player for Subsonic-compatible servers (Navidrome, Airsonic, Gonic) with a Spotify-like UI, extensive theming, and native mobile support - Windows (x64), Linux (x64), macOS (x64/arm64), Android, and iOS (sideloaded) from one codebase. v26.09.20 is the first release since February 2026, adding a persistent sidebar with full album/artist/song browsing, LAN-paired remote control between desktop and mobile, and a big performance/security pass.
- Persistent sidebar + library browsing
- LAN remote control (pair & control)
- Offline download cache (IndexedDB)
- 12 themes + editor
- Last.fm scrobbling
- Virtualized queue (25k+ songs)
- MPRIS2 (Linux)
GitHub repo → · Latest release →
Click to enlarge
Other Projects
- BeanMon - Lightweight X11 system monitor (CPU, RAM, disk) written in C
- tin - Minimal text editor in C
- tinterm - Fast terminal emulator using VTE
- tinshell - Custom shell in C
- lineprint - Faster cat alternative for terminal output
- Work-Term - Pomodoro timer in Python/tkinter
More on GitHub
Project Suggestions
Have an idea for a project? Suggest project ideas here →
Infrastructure Projects
Home Lab-"starhaven"
Dell Precision 3630 running Proxmox VE-13 guests (VMs + LXC), 64GB DDR4, GPU passthrough to Jellyfin, and a 9TB ZFS-backed storage pool. Provisioning, hardening, and fleet upgrades all run through Ansible, with Prometheus/Grafana watching the result.
Smart Home - Raspberry Pi 4
Hardware
- Device: Raspberry Pi 4 (BCM2711, 4GB RAM)
- Optimizations: CPU scaling, ZRAM, resource limits
- Uptime: 99.9% reliability
Stack
- Home Assistant
- Node-RED
- Zigbee2MQTT
- Docker
- Apache
- MQTT
Integrations
- HACS: Local WebRTC (secure local video), Local Tuya (cloud-free controls), MQTT clients
- Devices: 20+ smart devices managed via Zigbee
- Automation: Custom Node-RED workflows for family smart home