Senior System Administrator

Key Responsibilities: • Active Directory, DNS, DHCP, PKI, Group Policy — day-to-day administration • AD domain migration to a new forest, replacing Citrix VDI with an alternative solution, rebuilding the load-balancing stack (nginx, HAProxy, keepalived/VRRP) • Supporting VDI and terminal server farms, managing certificates • Upgrading legacy Windows servers, decommissioning outdated systems • Incident and request handling within SLA, on-call rotation Requirements: • 5+ years working with Microsoft and VDI infrastructure • Hands-on experience with AD domain/forest migration (ADMT, SID History, phased migration with minimal downtime) • Production experience with VDI or terminal server platforms • Linux (Ubuntu, AlmaLinux, CentOS/RHEL), load balancing, Hyper-V/VMware ESXi • English B1 or above