SR. SYSTEMS ADMINISTRATOR (LINUX)

Amentum•Waimea, HI

4d•$135,000 - $150,000•Onsite

About The Position

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.

Requirements

Two (2) years of System Administration/IT experience
Proficiency in automation tools and scripting (e.g., PowerShell, Bash, Python)
VMware/Nutanix certification
Knowledge/Administration of Trellix, LogRhythm, 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
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
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.

Nice To Haves

Advance certifications may be substituted for a degree or experience
Advance knowledge and certification in both Windows Server and RHEL is considered highly desired

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 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 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 DoW-approved tools to improve system performance and security.
Perform other duties as assigned.