Sr. Systems Administrator

Requisition Number: 28418 Required Travel: 0 - 10% Employment Type: Full Time/Salaried/Exempt Anticipated Salary Range: $120,000.00 - $130,000.00 Security Clearance: Secret Level of Experience: Mid This opportunity resides with Global Security (GS). Mission Technologies’ Global Security (GS) group comprises live, virtual, constructive (LVC) solutions; fleet sustainment; nuclear and environmental; and Australia business. As a trusted partner to our military customers, HII designs, develops and operates the largest LVC enterprise that prepares warfighters for cross-domain battle. With advanced technologies to enable mission readiness, HII understands that preparation requires full coordination—not readiness in piece-parts. For more than 40 years, the U.S. Navy has entrusted HII to maintain and modernize the vast majority of its fleet. With a holistic approach to life-cycle maritime defense systems—from small watercraft to submarines, surface combatants and aircraft carriers—HII ensures a high state of readiness. HII supports the Department of Energy’s national security mission through the management and operation of its sites, as well as the safe cleanup of legacy waste across the country. HII meets clients’ toughest nuclear and environmental challenges. Leadership Mindset at HII – Mission Technologies Leadership at HII is a mindset, not a title. Through our Leadership Capability Framework, we define how every team member contributes to our mission and culture: Know & Grow Your People – Commit to learning and supporting team success. Build Relationships – Communicate openly, collaborate well, and build trust. Take Ownership – Deliver on commitments and take pride in your work. Customer First – Focus on the mission and those we serve. Shape the Future – Bring ideas, curiosity, and continuous improvement. Act with Urgency – Take initiative and follow through with purpose. These capabilities guide how all employees contribute to our shared success across Mission Technologies. 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 Maintains smooth operation of multi-user computer systems, including coordination with network administrators. Duties may include and are not limited to: 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 (e.g. Windows11) systems, including installation, BIOS settings, patching Configure, upgrade, and administer switch IOS (e.g. 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 What you must have Required Education & Experience: Bachalors Degree with 12 years of relevant experince; OR Masters Degree with 10 years relevant experience Degree in Electrical/Electronic/Computer Engineering, Computer Science, or Information Systems Required Knowledge & Skills: Demonstrated ability to architnitiatives.ect, 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 i Required Credentials: Ability to otain 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. Occasional travel to customer sites may be required. 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. Meet HII’s Mission Technologies Division Our team of more than 7,000 professionals worldwide delivers all-domain expertise and advanced technologies in service of mission partners across the globe. Mission Technologies is leading the next evolution of national defense – the data evolution - by accelerating a breadth of national security solutions for government and commercial customers. Our capabilities range from C5ISR, AI and Big Data, cyber operations and synthetic training environments to fleet sustainment, environmental remediation and the largest family of unmanned underwater vehicles in every class. Find the role that’s right for you. Apply today. We look forward to meeting you. To learn more about Mission Technologies, click here for a short video: HII is more than a job - it’s an opportunity to build a new future. 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. Why HII We build the world’s most powerful, survivable naval ships and defense technology solutions that safeguard our seas, sky, land, space and cyber. Our workforce includes skilled tradespeople; artificial intelligence, machine learning (AI/ML) experts; engineers; technologists; scientists; logistics experts; and business administration professionals. Recognized as one of America’s top large company employers, we are a values and ethics driven organization that puts people’s safety and well-being first. Regardless of your role or where you serve, at HII, you’ll find a supportive and welcoming environment, competitive benefits, and valuable educational and training programs for continual career growth at every stage of your career. Together we are working to ensure a future where everyone can be free and thrive. 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. Do You Need Assistance? 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.aa415a4b-8b21-40fc-a65c-70d2b25ca29a