Senior Systems Administrator (Linux)

Amentum-posted 3 months ago
$105,000 - $145,000/Yr
Full-time • Senior
5,001-10,000 employees
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Amentum is seeking a highly experienced Senior Linux System Administrator to oversee and manage enterprise-level Linux infrastructure in support of U.S. Navy operations within a Department of Defense (DoD) 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 DoD cybersecurity policies.
  • Apply and manage patches and updates across all Linux systems in accordance with DoD 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 PowerShell 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 DoD-approved tools to improve system performance and security.
  • Perform other duties as assigned.
  • Advance knowledge and certification in both Windows Server and RHEL is considered highly desired.
  • Proficiency in automation tools and scripting (e.g., PowerShell, Bash, Python).
  • VMware/Nutanix certification.
  • Knowledge/Administration of Trellix, LogRhythm, and MDE.
  • Experience with DoD systems and infrastructure.
  • Knowledge of Cyber Security Methods and Techniques.
  • Knowledge of DoD IT systems, to include Windows, RHEL, and comprehensive infrastructure concepts.
  • Advance certifications may be substituted for a degree or experience.
  • Medical, dental and vision insurance.
  • 401(k) retirement plan.
  • Life insurance.
  • Long term and short term disability insurance.
  • 15 days of paid time off.
  • Parental leave.
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