Sr. Systems Administrator - 28418

Summary 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 Responsibilities Maintain 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 systems. Configure, upgrade, and administer Linux (RHEL, Rocky) systems, including installation, BIOS settings, patching. Configure, upgrade, and administer Windows (Windows 11) systems, including installation, BIOS settings, patching. Configure, upgrade, and administer switch IOS (HP Aruba and Cisco) systems, including installation, BIOS settings, patching. Provide troubleshooting for the environment to provide local and distance support for peers and coworkers. Provide recommendations to the customer based on issues during installation, and operational testing, to include issues with patching and cyber security. Attend various meetings as related to products. Work with customers through the lifecycle of the project from planning, procurement, Test & Evaluation, Implementation, & Operations and Maintenance. Assist with trouble‑ticket creation, resolution, implementation. Document creation, review, updates, releasability reviews. Required Education & Experience Bachelor’s Degree with 12 years of relevant experience; OR Master’s Degree with 10 years relevant experience. Degree in Electrical/Electronic/Computer Engineering, Computer Science, or Information Systems. Required Knowledge & Skills Demonstrated ability to architect, initiate, 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 improvement. Required 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 Qualifications Experience with Foreign Military Sales (FMS). Experience with Navy Training Systems. Physical Requirements May 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. Travel Requirements Occasional travel to customer sites may be required. Salary Range The listed salary range for this role is intended as a good faith estimate based on the role's location, expectations, and responsibilities. When extending an offer, HII's Mission Technologies division takes a variety of factors into consideration which include, but are not limited to, the role's function and a candidate's education or training, work experience, and key skills. Benefits We offer competitive benefits such as best‑in‑class medical, dental and vision plan choices; wellness resources; employee assistance programs; Savings Plan Options (401(k)); financial planning tools, life insurance; employee discounts; paid holidays and paid time off; tuition reimbursement; as well as early childhood and post‑secondary education scholarships. Bonus/other non‑recurrent compensation is occasionally offered for qualified positions, and if applicable to this role will be addressed by the recruiter at the screening phase of application. EEO Statement All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, physical or mental disability, age, or veteran status or any other basis protected by federal, state, or local law. Reasonable Accommodation If you need a reasonable accommodation for any part of the employment process, please send an e‑mail to View email address on click.appcast.io and let us know the nature of your request and your contact information. Reasonable accommodations are considered on a case‑by‑case basis. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to from this email address. Additionally, you may also call View phone number on click.appcast.io for assistance. Press #3 for HII Mission Technologies. #J-18808-Ljbffr Huntington Ingalls Industries