Senior Systems Administrator

Responsibilities

• Installs, configures, administers, maintains, and decommissions physical and virtual Windows and Linux servers within the Hill CEDC environment.
• Performs operating system installation, configuration, patching, hardening, upgrades, and lifecycle maintenance in accordance with approved security and change-management processes.
• Administers virtualized environments, including creating, configuring, monitoring, migrating, and retiring virtual machines and associated resources.
• Diagnoses and resolves system, operating system, application, virtualization, storage, network-connectivity, and performance issues to maximize availability and operational service levels.
• Coordinates with hardware, network, cybersecurity, database, storage, and application-support personnel to troubleshoot and resolve infrastructure incidents and service requests.
• Configures and maintains Windows- and Linux-based services, including user authentication, directory services, domain services, DNS, DHCP, file services, print services, and system logging, as applicable.
• Performs system backups, restores, replication, and recovery actions; supports validation of backup and disaster-recovery procedures.
• Monitors server health, system performance, capacity, availability, event logs, and security alerts; takes corrective action or escalates issues as required.
• Implements and maintains approved operating system security configurations, vulnerability remediation actions, security patches, antivirus or endpoint-security tools, and compliance settings.
• Supports assessment and remediation of cybersecurity vulnerabilities, misconfigurations, and findings in coordination with cybersecurity personnel and system owners.
• Maintains privileged-access controls, account administration, group memberships, and role-based access in accordance with approved procedures and least-privilege principles.
• Supports installation, configuration, and sustainment of enterprise applications and supporting middleware in coordination with application owners and vendors.
• Performs software installation, licensing support, version upgrades, and configuration changes while maintaining accurate system documentation.
• Develops, maintains, and executes standard operating procedures (SOPs), system-administration guides, configuration baselines, and troubleshooting documentation.
• Documents system configurations, dependencies, maintenance actions, incidents, changes, and recovery