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
Compensation Details:
$105K - $145K
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, market data, applicable collective bargaining agreements, and relevant laws.
Benefits Overview:
Our health and welfare benefits are designed to support you and your priorities. Offerings include:
Health, dental, and vision insurance
Paid time off and holidays
Retirement benefits (including 401(k) matching)
Educational reimbursement
Parental leave
Employee stock purchase plan
Tax-saving options
Disability and life insurance
Pet insurance
Note: Benefits may vary based on employment @type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.
Original Posting:
02/06/2026 - Until Filled
Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.
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 (https://postings.govdocs.com/#/vxSkbztPuAwwxfs) .
