Senior Systems Administrator (Linux)

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.

RESPONSIBILITIES:

• 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.

Physical Elements:

Lifting: 25 - 50lbs

Positions: Walking/Standing; Crawling/Kneeling; Stooping; Sitting; Frequent climbing

Pushing/ Pulling: 25 - 50lbs

Environmental: Customer Contact; Extended Work Day; Confined Work Area; Office Laboratory; Field Assignment; Inclement Weather

MINIMUM QALUIFICATIONS

Experience:

• 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

Education:

• Bachelor's degree and 7+ years of System Administration/IT experience

OR

• HS Diploma and 12 years of of System Administration/IT experience

*Advance certifications may be substituted for a degree or experience

Required Training, Licenses and Certifications:

• DoD 8570/8140 IAT II
• One of the following OS Certifications required
  • Linux
    • Linux+
    • Red Hat Certified System Administrator (RHCSA)

Security Clearance
Top Secret security clearance is required with T5 or equivalent (SSBI) investigation level. Applicants selected must be a US Citizen to apply for a Secret Security Clearance. Applicants selected either must currently possess a Secret clearance or will be subject to a 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.

Compensation

The annual starting salary for the position is between $105K - $145K. Factors which may affect starting pay within this range may include geography/market, skills, education, experience and other qualifications of the successful candidate.

Benefits

Amentum offers the following benefits for this position, subject to applicable eligibility requirements: medical, dental and vision insurance, 401(k) retirement plan, life insurance, long term and short term disability insurance, 15 days of paid time off, and parental leave.

This position includes a competitive benefits package. For more detailed information on our Benefits and what it is like to work for Amentum: Please visit our careers site: www.amentumcareers.com

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters .