Senior Systems Administrator - Generalist

Requisition Number: 29085

Required Travel: 0 – 10%

Employment Type:

Full Time/Salaried/Exempt

Anticipated Salary Range: $ – $

Security Clearance: TS/SCI

Level of

Experience:

Mid

This opportunity resides with Warfare Systems (WS), a business group within HII’s Mission Technologies division. Warfare Systems comprises cyber and mission IT; electronic warfare; and C5

ISR systems.

HII works within our nation’s intelligence and cyber operations communities to defend our interests in cyberspace and anticipate emerging threats. Our capabilities in cybersecurity, network architecture, reverse engineering, software and hardware development uniquely enable us to support sensitive missions for the U.S. military and federal agency partners.

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 C5

ISR, 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.

HII’s Mission Technologies division is dedicated to delivering cutting‑edge solutions that advance national security and defense objectives. This position is part of our Cyber and Intelligence division, which plays a critical role in supporting Enterprise‑Level Security and Modernization efforts across IT infrastructure, cybersecurity, physical facilities, and personnel operations.

The selected candidate will contribute to a high‑impact government program focused on enhancing and securing mission‑critical systems and environments. This program launched in early 2026 and, due to its classified nature and the sensitivity of the operational environment, an active TS/SCI security clearance will be required.

You will serve as a senior technical resource responsible for administering, securing, and optimizing both Windows and Linux environments that support critical enterprise and mission workloads. In this role, you apply deep cross‑platform expertise to ensure systems are designed, configured, and maintained for reliability, performance, and compliance with organizational standards.

Key responsibilities include managing and troubleshooting complex issues across Windows Server and Red Hat/other Linux distributions; performing system installations, configurations, patching, and lifecycle maintenance; and ensuring effective integration with networking, storage, virtualization, and security services.

You will develop and maintain automation to streamline routine operations, contribute to configuration baselines, and support system hardening and vulnerability remediation. You may also participate in solution design activities such as documenting system architectures, evaluating platform improvements, and supporting deployments of new capabilities.

Additionally, you will provide guidance to junior administrators, conduct system testing, validate operational readiness, and ensure both Windows and Linux systems remain stable, secure, and aligned with enterprise and mission requirements.

• 7+ years of progressively responsible hands‑on systems administration of enterprise server operating systems (Windows Server, Red Hat Enterprise Linux (RHEL)) and server applications (e.g., Active Directory, Exchange, File Services, and SQL server).
• 5+ years of experience administering a complete Microsoft AD domain and forest functional level, to include domain controllers, global catalogs, LDAP/S, DNS, and DHCP.
• Experience applying and maintaining a standard security configuration based on SRGs and STIGs.
• Must meet DoD 8140/CSWF for 451‑Intermediate or be willing to obtain the appropriate credential within 6 months.
• TS/SCI clearance required with ability to obtain CI Poly.

• Experience leveraging scripting technologies (e.g., Power Shell, Batch,…