Sr. Systems Administrator

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.

• 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.

• 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.

• 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.

• 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.

• Experience with Foreign Military Sales (FMS).
• Experience with Navy Training Systems.

• 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.

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…