Sr. 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&Ms, 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 information or Closed/Restricted Areas throughout duration of employment.

$135K - $150K

The compensation range or hourly rate listed for this position is provided as a good‑faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity,…