Middle Systemadministrator

Maintain network and server infrastructure for a production enterprise supporting 150+ users, 10+ servers, and 97 workstations. Administer Windows Server roles including AD, DNS, GPO, WSUS, RDP, and VPN for 150 users; enforce security policies and maintain antivirus, SIEM, NGFW, and DLP controls. Administer Kaspersky Security Center for centralized endpoint protection across workstations and servers. Administer Linux-based services including OpenVPN, Bitrix24, Zabbix, and Grafana; built Grafana dashboards for monitoring 50+ hosts and services. Administer Veeam backups and MSSQL databases, including deployment and maintenance plans, for 10 systems and databases. Administer CryptoPro, SBIS, OFD, and EDO for 70 users; support MS Exchange, 1C, and access control systems. Maintain LAN, Wi-Fi, servers, routers, and cameras; installed and maintained video surveillance at 4 sites with 200+ cameras. Automated 10+ recurring administrative tasks with Bashs (#!/bin/bash). Administer Grandstream IP telephony and mail services on cloud-based video hosting infrastructure for 150 users. Provided technical and software support to 150+ users, including consulting on LAN and general-purpose software. Developed C++ drivers for an internal device model, improving device compatibility and reducing manual workarounds. Selected Project Deployed and administered Secret Net Studio as the endpoint protection platform (EPP), including agent deployment, security policy configuration, and ongoing administration

Installed and configured computer networks for approximately 20 offices and users. Administered mail servers for approximately 20 users. Deployed and regularly updated antivirus software on approximately 20 workstations. Installed and administered web servers hosting 2 internal services.