The System Administrator is responsible for operating and optimizing server infrastructure, ensuring system stability, high availability, security compliance, and supporting production deployments.As a System Administrator, your responsibilities will be: Manage Linux/Windows servers and virtualization platforms (VMware, Proxmox, Hyper-V).Maintain core infrastructure services (DNS, DHCP, NTP, LDAP/AD, File/Web/Mail, Backup).Deploy and operate monitoring systems (Prometheus, Grafana, Zabbix).Ensure high availability via multi-AZ/cluster architectures.Implement PCI DSS patching and vulnerability remediation.Harden OS, network, and firewall configurations.Manage centralized logging and enforce RBAC/Least Privilege.Operate VPN connections and troubleshoot network issues.Support application deployment with DevOps/CI/CD pipelines.Run backup/restore, DR operations, on-call support, and RCA reporting