06/26/2026 updated
100 % available
Senior Windows System Administrator | AD, DNS, DHCP, GPO, M365, Exchange
Zagreb, Croatia
Worldwide
Bachelor's DegreeAbout me
System Administrator & DevOps Engineer experienced in Windows/Linux servers, IIS, cPanel/WHM, Plesk, WHMCS, Proxmox, Hyper-V, Microsoft 365, DNS, email, migrations, security and hosting. I solve server, website and email issues quickly and reliably.
Azure DevOpsProxmoxActive DirectoryMicrosoft AzureSymantec Backup ExecCloud ComputingServer ClusteringCPanelDevOpsExchange Web Services (EWS)Hyper-VInternet Information Services (IIS)Linux ServersNGINXWindows PowerShell
Windows Server Administration
Expertise in Windows Server environments (2003-2024), Active Directory, DNS, DHCP, Group Policy, IIS, RDP, PowerShell, Exchange, and Microsoft 365, with 8+ years of hands-on experience in enterprise infrastructure operations and secure government IT environments.
Cloud Infrastructure Management
Proficiency in Azure, AWS, GCP, and Oracle Cloud, including cloud VM operations, cloud migration, hybrid infrastructure design, RBAC, backup, and monitoring across multi-cloud environments.
Linux System Administration
Strong background in Ubuntu, Debian, CentOS, RHEL, AlmaLinux, SSH, systemd, Apache, Nginx, LiteSpeed, PHP-FPM, MySQL, MariaDB, Bash, cron, log analysis, and server hardening for production hosting environments.
Automation & Scripting
Practical experience with Bash, PowerShell, Docker, Git, CI/CD basics, monitoring automation, and backup automation, including automating 85% of recurring infrastructure operations saving 12+ hours per week.
Mail Server Administration
Hands-on experience with Exchange, Microsoft 365, Zimbra, Postfix, Exim, SPF, DKIM, DMARC, and email deliverability configuration and troubleshooting.
Security & Hardening
Knowledge of Fail2Ban, WAF, ModSecurity, Imunify360, SSL/TLS, RBAC, firewall hardening, and least privilege principles applied across government and commercial environments.
Networking
Experience with pfSense, MikroTik, IPsec, WireGuard, OpenVPN, Cloudflare, firewall, NAT, VPN, and DNS configuration and management.
Virtualization
Operational experience with VMware ESXi, vCenter, Hyper-V, Proxmox, including backup, restore, and migration of 30+ virtual machines.
Web Hosting Platforms
Administration of WHM/cPanel, Plesk, CyberPanel, CloudLinux, LiteSpeed, Imunify360, ModSecurity, SSL, DNS zones, VPS, dedicated servers, and shared hosting environments.
Monitoring & Observability
Use of Prometheus, Grafana, ELK Stack for log analysis, uptime monitoring, SLI/SLO/SLA management, and MTTR optimization across production systems.
Expertise in Windows Server environments (2003-2024), Active Directory, DNS, DHCP, Group Policy, IIS, RDP, PowerShell, Exchange, and Microsoft 365, with 8+ years of hands-on experience in enterprise infrastructure operations and secure government IT environments.
Cloud Infrastructure Management
Proficiency in Azure, AWS, GCP, and Oracle Cloud, including cloud VM operations, cloud migration, hybrid infrastructure design, RBAC, backup, and monitoring across multi-cloud environments.
Linux System Administration
Strong background in Ubuntu, Debian, CentOS, RHEL, AlmaLinux, SSH, systemd, Apache, Nginx, LiteSpeed, PHP-FPM, MySQL, MariaDB, Bash, cron, log analysis, and server hardening for production hosting environments.
Automation & Scripting
Practical experience with Bash, PowerShell, Docker, Git, CI/CD basics, monitoring automation, and backup automation, including automating 85% of recurring infrastructure operations saving 12+ hours per week.
Mail Server Administration
Hands-on experience with Exchange, Microsoft 365, Zimbra, Postfix, Exim, SPF, DKIM, DMARC, and email deliverability configuration and troubleshooting.
Security & Hardening
Knowledge of Fail2Ban, WAF, ModSecurity, Imunify360, SSL/TLS, RBAC, firewall hardening, and least privilege principles applied across government and commercial environments.
Networking
Experience with pfSense, MikroTik, IPsec, WireGuard, OpenVPN, Cloudflare, firewall, NAT, VPN, and DNS configuration and management.
Virtualization
Operational experience with VMware ESXi, vCenter, Hyper-V, Proxmox, including backup, restore, and migration of 30+ virtual machines.
Web Hosting Platforms
Administration of WHM/cPanel, Plesk, CyberPanel, CloudLinux, LiteSpeed, Imunify360, ModSecurity, SSL, DNS zones, VPS, dedicated servers, and shared hosting environments.
Monitoring & Observability
Use of Prometheus, Grafana, ELK Stack for log analysis, uptime monitoring, SLI/SLO/SLA management, and MTTR optimization across production systems.
Experience
Professional experience5 - 10 years
Freelancer since2022
Languages
GermanBasic knowledgeEnglishFluentRussianBasic knowledgeTurkishNative speaker
Project history
Architected and operated multi-tenant hosting platform serving 500+ VPS/dedicated servers across 3 global data centers. Maintained 99.9% uptime SLA and reduced new client provisioning time from 4 hours to 15 minutes via automation and standardized provisioning workflows. Implemented defense-in-depth security stack including Cloudflare WAF, ModSecurity, Fail2Ban, Imunify360, RBAC, and SSH hardening.
Built and operated hosting infrastructure for 500+ VPS/dedicated/shared environments across Azerbaijan and EU markets. Automated 85% of recurring infrastructure operations using Bash, Python, and GitHub Actions, saving 12+ hours/week. Deployed and maintained production Linux hosting stacks including WHM/cPanel, CloudLinux, LiteSpeed, Nginx, MySQL, DNS, and SSL.
Delivered 300+ infrastructure projects including server migrations, cloud setups, CI/CD pipelines, security hardening, DNS, SSL, and mail deliverability for clients across 30+ countries. Maintained 5.0-star rating with 300+ public reviews and Preferred/Verified Freelancer status. Specialized in urgent production incident response with average resolution time under 2 hours.