Systems Administrator

Sr. Systems AdministratorSummary HII Mission Technologies is seeking a Sr. Systems Administrator to provide mid-level system administration, lifecycle upgrades, and enterprise support for distributed Navy training environments. This role ensures reliable operation of Linux- and Windows-based systems, performs OS upgrade efforts and provides technical support and leadership across sites. The position requires independent technical judgment, strong problem-solving ability, and the expertise to maintain secure, high-availability systems. This full-time, on-site role is part of a high-performing engineering team delivering mission-driven solutions that improve warfighter training and decision-making.Key Job ResponsibilitiesMaintains smooth operation of multi-user computer systems, including coordination with network administrators.Maintain multi-OS lab environment (i.e. RHEL, Rocky, Windows 11) systems across standalone network systems in a lab environment to support USN BFTT/ATD training systemsConfigure, upgrade, and administer Linux (RHEL, Rocky) systems, including installation, BIOS settings, patchingConfigure, upgrade, and administer Windows (e.g. Windows11) systems, including installation, BIOS settings, patchingConfigure, upgrade, and administer switch IOS (e.g. HP Aruba and Cisco) systems, including installation, BIOS settings, patchingProvide troubleshooting for the environment to provide local and distance support for peers and coworkersProvide recommendations to the customer based on issues during installation, and operational testing, to include issues with patching and cyber securityAttend various meetings as related to productsWork with customers through the lifecycle of the project from planning, procurement, Test & Evaluation, Implementation, & Operations and MaintenanceAssist with trouble-ticket creation, resolution, implementationDocument creation, review, updates, releasability reviewsRequired Education & Experience:Bachelors Degree with 12 years of relevant experience; ORMasters Degree with 10 years relevant experienceDegree in Electrical/Electronic/Computer Engineering, Computer Science, or Information SystemsRequired Knowledge & Skills:Demonstrated ability to architect, manage, and secure complex enterprise-level systems and servers.Advanced proficiency with Red Hat Enterprise Linux (RHEL), including configuration, system hardening, and deep troubleshooting across multiple versions.Proven expertise with the Assured Compliance Assessment Solution (ACAS), Security Content Automation Protocol (SCAP), and large-scale patch management.Background mentoring technical staff and contributing to system modernization and improvementRequired Credentials:Ability to obtain a DoD Information Assurance Technician (IAT) Level II certification or higher (e.g., Security+ CE, CCNA Security, CySA+) within 3 months of hire if not currently held.Must be a U.S. Citizen.Must have a current or active DoD Secret clearance.Preferred QualificationsExperience with Foreign Military Sales (FMS).Experience with Navy Training Systems.Physical RequirementsMay require working in an office, industrial, shipboard, or laboratory environment. Must be capable of climbing ladders and tolerating confined spaces and a range of temperature conditions during shipboard or testing activities.Occasional travel to customer sites may be required.