Senior Systems Administrator; Linux

Amentum is seeking a Sr. Systems Administrator (Linux) for a position on Kauai, HI to oversee and manage enterprise-level Linux infrastructure in support of U.S. Navy operations within a Department of Defense (DoW) environment. This role requires deep technical expertise in Linux systems, leadership in secure system administration, and a strong working knowledge of Risk Management Framework (RMF) and NIST SP 800-53 controls.

The ideal candidate will demonstrate the ability to lead teams, manage complex environments, and ensure cybersecurity compliance across classified and unclassified networks.

• Administer and maintain Red Hat Linux (RHEL) and other Linux-based environments in classified and unclassified environments across Navy networks.
• Implement and maintain RMF security controls and ensure systems are compliant with DISA STIGs and DoW cybersecurity policies.
• Apply and manage patches and updates across all Linux systems in accordance with DoW and Navy patch management policies.
• Manage automated installation methods and system imaging (e.g., SCCM, VMware, Nutanix, Satellite, Ansible)
• Perform system hardening, patching, and vulnerability remediation using tools such as ACAS, ESS, and SCAP.
• Develop and maintain Power Shell scripts for automation of administrative tasks and system configuration.
• Support virtualization platforms (VMware, Hyper-V) and manage virtual infrastructure lifecycle.
• Collaborate with cybersecurity teams to support ATO packages, POA&M, and audit readiness.
• Maintain system documentation, configuration baselines, and standard operating procedures (SOPs).
• Provide mentorship to junior administrators and IT support staff.
• Participate in Change Control Boards (CCBs) and Configuration Management Boards (CMBs).
• Assist with incident response, forensic analysis, and system recovery efforts.
• Support backup and disaster recovery strategies using enterprise tools (e.g., Veeam, Commvault).
• Evaluate and recommend new Linux technologies and DoW-approved tools to improve system performance and security.
• Perform other duties as assigned.

• Lifting, Pushing/Pulling: 25
  -50lbs
• Work positions requirements: walking, standing, crawling, kneeling, cramped, sitting and work requiring repeated stooping or frequent climbing.
• Environment: customer contact, extended workday, confined work area, office laboratory, field assignment, and inclement weather.

Experience

• Two (2) years of System Administration/IT experience
• Advance certifications may be substituted for a degree or experience
• Proficiency in automation tools and scripting (e.g., Power Shell, Bash, Python)
• VMware/Nutanix certification
• Knowledge/Administration of Trellix, Log Rhythm, and MDE
• Experience with DoW systems and infrastructure
• Knowledge of Cyber Security Methods and Techniques
• Knowledge of DoW IT systems, to include Windows, RHEL, and comprehensive infrastructure concepts

Education

• Bachelor's Degree
• High School or equivalent with eight (8) years of system administration experience may be substituted for a bachelor’s degree.

• DoD 8570/8140 IAT II
• Red Hat Certified System Administrator (RHCSA) certification

• Advance knowledge and certification in both Windows Server and RHEL is considered highly desired

Must be able to obtain and maintain a Top Secret US Government Clearance.

Note:

US Citizenship is required to obtain and maintain a Top Secret Clearance. Applicants selected either must currently possess a Top Secret clearance or will be subject to a US Government Security Investigation and must meet eligibility requirements to obtain clearance prior to commencement of employment and maintain a security clearance for access to classified…