DoW Linux System Administrator (Mid/Senior) - 28244

Step into a senior technical role where your architecture, hardening, and automation skills-particularly in Linux environments-directly enable engineers building critical Department of War technologies. As a SysAdmin, you are the technical authority for program-owned infrastructure: designing secure identity and network patterns, leading incident response, establishing STIG-aligned baselines for Linux and hybrid platforms, and driving automation so our systems are reliable, auditable, and fast. You'll collaborate with DevSecOps on cloud and CI/CD platform integration, and help prove readiness through RMF/ATO evidence, vulnerability closure, and measurable SLAs.

If you thrive on solving complex problems, designing resilient systems, and leading high-stakes technical work with visible mission impact, this is your seat at the table.

Essential Job Responsibilities

• Maintains smooth operation of multi-user computer systems, including coordination with network administrators.
• Interacts with users and evaluates vendor products.
• Makes recommendations to purchase hardware and software, coordinates installation and provides backup recovery.
• Develops and monitors policies and standards for allocation related to the use of computing resources.
• Ancillary duties may include setting up administrator and service accounts, maintaining system documentation, tuning system performance, installing system wide software and allocating mass storage space.
• Position will be on-site in Roanoke, VA.

• Demonstrated experience administering and securing primarily Linux enterprise environments
• Strong knowledge of networking fundamentals, including DNS, DHCP, VLANs, routing, and firewall concepts
• Experience performing system hardening, patch management, and vulnerability remediation
• Proven ability to manage multi-user system environments and collaborate with network, security, and engineering teams
• Experience developing or maintaining system documentation, configurations, and operational procedures
• Ability to obtain and maintain a DoD security clearance and meet program-specific eligibility requirements

Systems Administrator II3 years relevant experience with Bachelors in related field; 1 year relevant experience with Masters in related field; or High School Diploma or equivalent and 7 years relevant experience.

Systems Administrator III6 years relevant experience with Bachelors in related field; 4 years relevant experience with Masters in related field; or High School Diploma or equivalent and 10 years relevant experience.

Systems Administrator IV10 years relevant experience with Bachelors in related field; 8 years relevant experience with Masters in related field; or High School Diploma or equivalent and 14 years relevant experience.

Preferred Requirements

• Active TS/SCI clearance preferred
• Demonstrated experience hardening systems using DISA STIGs and supporting RMF/ATO efforts
• Expertise with infrastructure automation (Ansible, Terraform, PowerShell DSC, or similar)
• Experience designing and managing identity services (AD, LDAP, PKI) and Zero Trust-aligned architectures
• Hands-on experience with virtualization platforms (VMware, Nutanix, or similar)
• Familiarity with DevSecOps toolchains and CI/CD pipelines (GitLab, Jenkins, Nexus, Artifactory)
• Strong background in monitoring, observability, and performance tuning
• Prior experience in a secure DoD, IC, or defense contractor environment
• Proven ability to lead incident response and root-cause analysis for enterprise systems

Physical Requirements

• Must be able to work on-site in Roanoke, Virginia, supporting a secure, customer-facing environment
• Able to sit or stand for extended periods while working at a computer workstation
• Occasional lifting (up to approximately 25 lbs) for tasks such as moving equipment or racking hardware
• Ability to access data center or lab environments, which may require bending, stooping, or climbing short ladders
• Ability to travel occasionally for meetings, training, or mission support, if required

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.

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 C5ISR 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. 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., 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.