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Mirek Gajdečka

Senior Data & Infrastructure Consultant • Teradata • Linux/Unix • Oracle/PostgreSQL • Monitoring • Virtualization
Teradata Oracle Linux Proxmox UniFi Nextcloud Vaultwarden Nginx Proxy Manager Authelia Home Assistant AdGuard Home Uptime Kuma Jellyfin Synology NAS OpenMediaVault PostgreSQL MariaDB InfluxDB Redis
Location
Prague, CZ
Experience
15+ years in IT operations
Availability
Part-time retainer, remote-first
Incident & RCA
Triage, root cause analysis, stakeholder communication and safe recovery actions.
Performance tuning
SQL and platform analysis, capacity thinking and change proposals.
Automation
Shell, SQL and practical operations automation for repeatable outcomes.
Security-first mindset
Segmentation, reverse proxy, access control, monitoring and restore-tested backups.

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Consulting and hands-on delivery across data platforms and Linux infrastructure: incident handling, performance tuning, change proposals, and cross-team/customer collaboration.

Professional summary

15+ years in IT operations and support, focused on Unix/Linux application environments, database platforms, and monitoring in international teams. My main day-to-day domain is senior Teradata consulting: production support, incidents, performance optimization, and architecture-related changes.

Strong hands-on overlap with Linux infrastructure, Oracle/PostgreSQL databases, monitoring solutions, and automation using shell/SQL scripting. Comfortable bridging engineering and operations: translating incidents into actionable improvements, documented changes and safer operational decisions.

Teradata Oracle PostgreSQL Linux / Unix Zabbix Nagios Virtualization

Selected self-managed projects

Practical side projects and self-managed implementations that complement my main consulting profile and show current hands-on work across automation, networking, storage and owned infrastructure.

  • Local smart home platform built around Home Assistant, Zigbee2MQTT and MQTT
  • Private cloud and file sync through Nextcloud
  • Self-hosted password management with Vaultwarden
  • Service monitoring and visibility with Uptime Kuma
  • Segmented homelab networking on UniFi with DMZ and reverse proxy
  • Storage and backup layer using Synology NAS and OpenMediaVault
  • Media and utility services including Jellyfin and AdGuard Home
Home Assistant Nextcloud Vaultwarden Uptime Kuma UniFi Proxmox Jellyfin AdGuard Home Synology NAS OpenMediaVault

Current homelab / infrastructure profile

Practical demonstration of security-first infrastructure design: segmentation, DMZ placement, reverse proxy, identity/access control, centralized DNS, observability, self-hosted services and regular backup/restore testing.

UniFi (segmented VLAN design) Proxmox VE Nginx Proxy Manager Authelia Home Assistant Zigbee2MQTT MQTT Nextcloud Vaultwarden Uptime Kuma AdGuard Home Jellyfin Synology NAS OpenMediaVault Synology NAS OpenMediaVault
Architecture highlights: segmented network roles, reverse proxy in DMZ, DNS filtering, monitoring and a self-hosted service stack covering automation, storage, password management, media and utility services, with Synology NAS and OpenMediaVault forming part of the storage and backup layer.

Project pages

Home Assistant

Home Assistant

Local smart home platform

A broader smart home project built around local control, dashboards, heating logic, sensors, automations, and practical day-to-day reliability.

 Nextcloud

Nextcloud

Private cloud / file sync

Self-hosted file sync and sharing designed as a private cloud alternative with direct ownership over data and access paths.

 Vaultwarden

Vaultwarden

Self-hosted password manager

A lightweight private password vault setup used to keep credential storage under direct control while retaining the convenience of modern password management.

 Uptime Kuma

Uptime Kuma

Monitoring & service visibility

A practical monitoring layer for service availability, grouped checks and quick operational visibility across self-hosted services.

 UniFi / network segmentation

UniFi / network segmentation

Structured homelab networking

A segmented network layout separating management, homelab, IoT, guest and DMZ roles to keep self-hosted services more structured and safer to expose.

 Homepage dashboard

Homepage dashboard

Internal service portal

A simple internal landing page for core services, tools and infrastructure components used as a convenient operational entry point.

 Proxmox

Proxmox

Virtualization platform

The base virtualization layer for running isolated services, infrastructure utilities and evolving self-hosted workloads across the lab environment.

 Jellyfin

Jellyfin

Self-hosted media server

A private media server setup used as an owned alternative to closed media platforms for local streaming and direct library control.

 AdGuard Home

AdGuard Home

DNS filtering and local DNS control

A local DNS filtering and resolution layer used to control name resolution, reduce noise and keep core services reachable through predictable internal naming.

Experience (selected)

  • Your Edge Digital — Senior Consultant05/2022 – Present • Prague
    Teradata consulting: incidents, performance tuning, customer/team collaboration.
  • Teradata — Consultant02/2020 – 05/2022 • Prague
    Teradata platform consulting and support.
  • DHL IT Services — Senior Application Specialist10/2017 – 01/2020 • Prague
    Primary monitoring for prod/non-prod (Zabbix): upgrades, templates, plugins, expanded checks and operations automation.
  • EmbedIT — Senior Application Support Specialist07/2013 – 08/2017 • Brno
    Unix applications, Oracle DB, WebLogic, deployments, automation, maintenance and PDC/DRC tests, onboarding and training.
  • Tieto — Technical Specialist08/2010 – 06/2013
    L3 support: Unix applications, Oracle DB, BMC platform and Nagios monitoring.

Contact

LinkedIn: www.linkedin.com/in/mirek-gajdečka-10950856

Email: mirek.gajdecka@gmail.com

Phone: +420 722 473 180

Preferred contact: LinkedIn or email.