• Administer, operate, and optimize Active Directory (AD), DNS, DHCP, GPO.• Manage and deploy Windows Server (2016/2019/2022) and related services.• Administer and optimize Linux Servers (CentOS, RHEL, Ubuntu, Oracle linux) for business applications.• Manage and operate VMware vSphere/ESXi, including backup, snapshot, HA/DRS.• Monitor performance, capacity, and system logs; troubleshoot infrastructure and virtualization issues.• Participate in infrastructure projects: server, storage, backup, DR site implementation and upgrades.• Collaborate with the security team to implement information security measures (patching, hardening, access control).• Prepare technical documents, checklists, operational procedures, and periodic reports.• Provide internal support for infrastructure-related services (user accounts, access rights, mail servers, file servers, etc.).