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Experience level:
More than 5 years
Education level:
Vocational secondary
Languages:
Russian: Native
English: A2
System & Network administrator with practical experience in infrastructure maintenance and network troubleshooting. I work with MS Exchange/Postfix for mail services and use FreeBSD (OpenVPN), Cisco, and MikroTik to ensure stable connectivity. I am particularly effective at finding and fixing complex network issues like packet loss and ISP bottlenecks. I handle all IT needs for 100+ users, from server health to hardware support.
Technical Stack (Hard Skills):
1. Mail Systems: End-to-end deployment and administration of MS Exchange Server (DAG, transport rules, DB maintenance). Architectural design and implementation of Postfix from scratch (configured as a secure SMTP relay and anti-spam gateway).
2. Networking: Advanced configuration of Cisco (VLAN management, ACL lists) and MikroTik (routing, firewall). Greenfield deployment of OpenVPN infrastructure.
3. Network Diagnostics: Deep traffic analysis (WinMTR, Wireshark), bypassing ISP-level filtering (DPI), and localizing complex routing/packet loss issues.
4. Monitoring & Protection: Full-scale deployment of Zabbix from the ground up. Implementation of Backup & Disaster Recovery strategies (Veeam, Windows Server Backup) to ensure business continuity.
5. Virtualization & Infrastructure: Administration of VMware ESXi hypervisors. Comprehensive Active Directory (GPO, DNS, DHCP) and IIS management.
6. Hardware: Component-level PC/Server repair, maintenance of office equipment, and deployment of CCTV (Video Surveillance) systems.
Key Achievements:
1. Infrastructure Modernization: Designed and implemented key service upgrades, including a new Postfix-based mail relay and a centralized Zabbix monitoring system to improve visibility and security.
2. Secure Connectivity (FreeBSD): Deployed a new OpenVPN infrastructure on FreeBSD from scratch, replacing/expanding legacy remote access to provide stable encrypted tunnels for 100+ employees.
3. Data Resilience: Overhauled the backup strategy and disaster recovery plans, ensuring 100% recoverability for critical databases and virtual machines.
4. Expert Troubleshooting: Successfully resolved a critical 46% packet loss incident caused by Tier-1 ISP-side filtering. Localized the root cause via deep traffic analysis and implemented a bypass solution to restore cloud services.
5. Operations Management: Streamlined technical support and hardware maintenance for 100+ users, balancing high-level system administration with on-site hardware repairs and CCTV management.
Responsibilities:
1. Large-Scale User Support: Provided L1/L2 technical support for 300+ workstations across a two-building corporate campus.
2.Incident Resolution: Handled a high volume of hardware and software tickets, ensuring minimal downtime for engineering and administrative departments.
3. Workstation Deployment: Managed the full lifecycle of office hardware, including assembly, OS imaging, configuration, and maintenance.
4. Account Management: Performed routine Active Directory tasks (password resets, user permissions, and security group management).
5. Hardware & Peripherals: Maintained and repaired PCs, printers, and specialized office equipment on-site.
1. Achievements:
Successfully maintained stable operations for 300+ users as part of a small, efficient technical team.
2. Streamlined the workstation setup process, reducing the time required to deploy new employee seats.
Operating Systems: Practical administration of Linux (Ubuntu/Debian/CentOS) and FreeBSD; Windows Server environments. Mail & Directory Services: Administration of MS Exchange; setup and management of Postfix mail relays; Active Directory (GPO, DNS, DHCP). Networking: Configuration of Cisco (VLAN, ACL) and MikroTik routing/firewalls; deployment of OpenVPN on FreeBSD. Network Diagnostics: Advanced troubleshooting using WinMTR and Wireshark; traffic analysis and bypassing DPI/ISP-level packet loss. Monitoring & Backups: Deployment and template management in Zabbix (Linux-based); implementing data protection via Veeam and Windows Server Backup. Virtualization: Administration of VMware ESXi hypervisors and virtual infrastructure. Hardware & IT Operations: Component-level PC/Server repair; CCTV (Video Surveillance) maintenance; technical support for 100+ end-users.