Alex

Systems Administrator Infrastructure Engineer Cyber Security Enthusiast

Building secure, reliable and well documented IT infrastructure using open-source technologies and Microsoft platforms.

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About Me

I am a System Administrator focused on building secure, reliable and maintainable infrastructure.

My core focus areas include:

  • Linux Administration
  • Windows Server
  • Active Directory
  • Infrastructure Automation
  • Network Security
  • Hybrid Cloud
  • Open Source
  • Documentation
  • Helpdesk & System Support

I believe that good infrastructure should be simple, secure and well documented.

Skills & Technologies

Windows Ecosystem

Windows Server Active Directory DNS DHCP Group Policy PowerShell

Linux Systems

Ubuntu Server Bash Docker Postfix Dovecot

Networking

WireGuard VLAN MikroTik UniFi Kerio

Security & Infra

CrowdSec nftables Reverse Proxy TLS/SSL VPN

Automation & Tooling

Git GitHub VS Code YAML Ansible

Featured Projects

Enterprise Open Security Gateway

Active Dev

Open-source enterprise security gateway replacing expensive commercial firewall appliances using Ubuntu, Docker, CrowdSec and reverse proxy technologies.

Ubuntu Docker CrowdSec Nginx WireGuard

Hybrid Mail Infrastructure

In Progress

Corporate mail infrastructure integrating Microsoft Active Directory, Postfix, Dovecot and PostgreSQL.

Postfix Dovecot LDAP Windows Server Ubuntu

Infrastructure as Code

Development

Reusable Ansible roles for automated deployment of enterprise Linux services.

Ansible YAML Git Linux

Hybrid Cloud Lab

Active

Personal hybrid infrastructure connecting VPS and home lab through WireGuard.

Ubuntu Docker Windows Server VMware WireGuard

Infrastructure Architecture

High-level topology of the personal hybrid cloud lab and gateway environment.

Public Internet VPS Gateway Ubuntu + Nginx + CrowdSec WireGuard Mesh Encrypted Site-to-Site Tunnel Windows Server Active Directory / DNS / AD CS Ubuntu / Docker Host Postfix / Dovecot / Apps

Professional Timeline

2026
Enterprise Infrastructure Development
  • Started Enterprise Open Security Gateway project.
  • Developed Hybrid Corporate Mail Infrastructure with AD integration.
  • Migrated all infrastructure codebase to Git and VS Code deployment pipeline.
  • Built hybrid infrastructure connecting cloud VPS with local virtualization nodes via WireGuard.
  • Implemented central log processing and automated firewall rules.
2024
Relocation & Academic Focus
  • Started Cybersecurity & Systems Engineering studies.

Get in Touch

Open for opportunities, technical discussions, and infrastructure collaboration.

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