Windows/Linux System Administrator

Responsibilities Server infrastructure management: Ensure the stable, uninterrupted, and secure operation of physical and virtual servers (Windows Server and Linux). Active Directory and domain infrastructure: Manage AD DS, GPO, DNS, DHCP, WSUS, SCCM, IIS, and FSMO roles. Implement and audit security policies based on CIS Benchmarks. File servers: Manage shared resources, as well as NTFS and share permissions. Virtualization: Administer the VMware vSphere environment (vCenter, ESXi) and ensure the proper operation of HA and DRS. Manage servers hosted with local cloud providers through the VMware Cloud Director (vCloud) interface. Linux server administration: Install and configure Ubuntu, Debian, and Red Hat servers. Manage firewall rules (iptables, firewalld, UFW). Extend and shrink disk capacity (at the LVM, partition, and file system levels). Backup and disaster recovery: Implement the backup strategy using Veeam Backup & Replication and Acronis True Image, perform regular restore tests, and keep disaster recovery plans up to date. IP telephony: Administer the 3CX system (extensions, trunks, IVR, call routing rules). Infrastructure changes: Plan and safely implement changes to the existing infrastructure, including rollback plans. Automation and optimization: Automate repetitive administrative tasks using PowerShell, Bash, and Python scripts. Documentation and inventory: Keep server infrastructure diagrams, system roles, and IT asset records (Jira ITSM) continuously up to date. Requirements Bachelor's degree in Information Technology, Computer Engineering, Systems Engineering, or a related field. 1–2 years of experience as a System Administrator, including hands-on experience with on-premise and local cloud servers. Operating systems: In-depth knowledge of Windows Server 2022/2025 and Linux (Ubuntu, Debian, Red Hat/CentOS). Domain services: In-depth knowledge of Active Directory (AD DS, DNS, DHCP, WSUS, SCCM, IIS, Failover Clustering) and Group Policy. Linux: Installation, user and permission management, firewall rules, disk management with LVM, and service management (systemd). Virtualization: Experience with VMware vCenter, ESXi, HA, DRS, vMotion, and vCloud Director; knowledge of Proxmox VE is a plus. Networking: Understanding of TCP/IP protocols, setting up LAN/Wi-Fi networks, and basic configuration of switches and routers. Backup and monitoring: Experience with Veeam Backup & Replication, Acronis True Image, Zabbix, Uptime Kuma, and syslog platforms. IP telephony: Experience with 3CX. Security: Knowledge of the principle of least privilege, password and MFA policies, patch management, server hardening, and event log analysis. Scripting: Ability to automate administrative tasks using PowerShell, Bash, and Python. Preferred Qualifications RHCSA, Windows Server Hybrid Administrator Associate, VMware vSphere Foundation 9.0 Administrator (VCP-VVF Admin), or VMware Cloud Foundation 9.0 Administrator (VCP-VCF Admin) certifications. English proficiency sufficient to read technical documentation. Personal Qualities Open to innovation and eager to learn new technologies. Strong analytical thinking and fast problem-solving skills. Responsible and detail-oriented, especially when making changes in production environments. Strong teamwork and communication skills. Willingness to provide after-hours support when necessary Interested candidates can send their CV to the e-mail address in theApply for jobbutton.