IT Specialist · Prague, CZ
I run server and network infrastructure — from Proxmox clusters and virtualization to backups and monitoring. Secure, automated, and built to keep working at three in the morning.
# role role = "Systems Administrator" focus = ["network", "servers", "PKI"] years = 10+ # homelab nodes = 3x Proxmox cluster smart = Home Assistant monitoring = Zabbix network = ["WiFi", "Zigbee", "433 MHz"] power = "UPS" # backup power 🔋 backup = "3-2-1" # 3 locations ha_uplink = ["primary", "LTE backup"] uptime = "99.9 %" 🟢
// about
For over ten years I've worked at the intersection of networks, servers and development. I started as a Ruby developer, gradually moved closer to infrastructure, and today I use everything I've learned to get the best result — from the switch to the environment applications run in (Windows/Linux VMs, containers). What I enjoy most is server administration and virtualization.
In my spare time I focus on SmartHome and home automation, and explore new technologies and trends.
Network & security
VLAN segmentation, CAPsMAN, PKI for an internal CA, VPN (OpenVPN/WireGuard), LTE failover and Zabbix monitoring.
Servers & automation
Proxmox VE clustering, LXC containers, Docker, Ansible playbooks, CI/CD pipelines.
Development
Ruby, Bash, Python. REST API integration, DevOps practices, and documentation that's actually kept up to date.
Smart home
Home Assistant, Zigbee (ZHA/CC2531), Matter/Thread, Apple Home.
// technology
No buzzword bingo. These are the tools and technologies I use every single day.
Networking
Infrastructure
Security & PKI
Development
SmartHome
Client systems
Documentation & knowledge
// experience
Systems Administrator
Managing the Proxmox cluster and the company network. Proxmox updates, administration of Windows and Linux virtual machines, and monitoring and verification of backups.
IT Manager
Overall responsibility for IT at a smaller company — managing servers, networks and workstation hardware. Leading a team of two junior colleagues. On new projects I run the analysis, propose a solution and prepare the first working version for the client; then I gather feedback and take the project through to production.
IT Specialist
Managing all company IT — IT support for employees, company hardware, servers and networks, Microsoft 365 services. Working with Windows and Linux, server and network security including VPN (WireGuard) and routing. Running the company websites, selecting new hardware, and writing small Bash scripts.
Linux System Administrator
Design and implementation of a MariaDB cluster on HashiCorp Nomad. Managing Linux servers, automating processes and helping deliver projects.
IT Assistant
Supporting employees with computer, peripheral, software and hardware issues. Maintaining local infrastructure — network, Windows PCs and servers, Linux servers. Working with Microsoft 365 (Exchange, SharePoint), implementing and managing backup solutions, and running WordPress websites.
Ruby / DevOps Developer
Development and testing in Ruby, managing Docker environments (Swarm, Registry, Dockerfile). Implementing features, writing unit tests, hotfixes and documentation. Provisioning VMs on Debian and CentOS 7.
Developer & Administrator
Network and server administration for the CTU Prague student ISP. Building internal tools and supporting users.
// projects
A homelab as a testing ground for production. Every project solves a real problem.
Homelab
A Proxmox cluster with dozens of LXC containers and VMs. Self-hosted stack: wiki (BookStack), git server (Synology), mail backup, VPN, monitoring.
Smart home
Home Assistant with a Zigbee mesh (ZHA + CC2531), Matter/Thread, Apple Home and 433 MHz radio sensors. Custom gas-consumption reading from the gas meter's pulse output (Avatto ZDS16).
Home CA
A private certificate authority for the home network. Automatic issuance and renewal of certificates for internal websites, OpenVPN and other services.
Backups
Automatic backups of MikroTik configs to a Git repository. Gmail and iCloud backups via mbsync to my own server. Following the 3-2-1 rule — three copies across three locations.
// contact
Have a project, a question, or want to discuss working together? Drop me an email or reach out on LinkedIn.
Available for consulting