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Amentum · 3 months ago

Senior Systems Administrator (Linux)

Waimea, HI

Full-time

Onsite

Senior Level

$105K/yr - $145K/yr

7+ years exp

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 involves ensuring cybersecurity compliance, managing complex environments, and leading teams in secure system administration.

Mechanical EngineeringSecurityTechnical Support

No H1B

Security Clearance Required

U.S. Citizen Only

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

Qualification

Linux systems administrationRisk Management Framework (RMF)NIST SP 800-53 controlsPowerShell scriptingVMware certificationDoD cybersecurity complianceRed Hat Linux (RHEL)Cybersecurity methodsSystem documentationIncident responseTeam leadership

Required

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

Bachelor's degree and 7+ years of System Administration/IT experience OR HS Diploma and 12 years of System Administration/IT experience

Advance certifications may be substituted for a degree or experience

DoD 8570/8140 IAT II

One of the following OS Certifications required: Linux, Linux+, Red Hat Certified System Administrator (RHCSA)

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