Senior Systems Administrator (Linux)

Amentum•Waimea, HI

4d•$135,000 - $150,000•Onsite

About The Position

Amentum is seeking a Senior Systems Administrator (Linux) to oversee and manage enterprise-level Linux infrastructure supporting U.S. Navy operations in a Department of War (DoW) environment on Kauai, Hawaii. The role requires deep Linux technical expertise, leadership in secure system administration, and working knowledge of the Risk Management Framework (RMF) and NIST SP 800-53 controls. The administrator will lead teams, manage complex environments, and ensure cybersecurity compliance across classified and unclassified networks. The position requires a bachelor’s degree or an allowed substitution, specified certifications, and the ability to obtain and maintain a Top Secret U.S. Government clearance. Compensation is listed at $135,000–$150,000.

Requirements

Two years of system administration or IT experience.
Proficiency with automation tools and scripting, such as PowerShell, Bash, or Python.
VMware or Nutanix certification.
Knowledge of or administration experience with Trellix, LogRhythm, and MDE.
Experience with DoW systems and infrastructure.
Knowledge of cybersecurity methods and techniques.
Knowledge of DoW IT systems, including Windows, RHEL, and comprehensive infrastructure concepts.
Bachelor’s degree; a high school diploma or equivalent plus eight years of system administration experience may substitute for the bachelor’s degree.
DoD 8570/8140 IAT II certification.
Red Hat Certified System Administrator (RHCSA) certification.
Must be able to obtain and maintain a Top Secret U.S. Government clearance. U.S. citizenship is required to obtain and maintain the clearance; applicants must meet eligibility requirements before employment begins and maintain clearance throughout employment.

Nice To Haves

Advanced knowledge and certification in both Windows Server and RHEL.

Responsibilities

Administer and maintain Red Hat Linux (RHEL) and other Linux-based environments across classified and unclassified Navy networks.
Implement and maintain RMF security controls and ensure compliance with DISA STIGs and DoW cybersecurity policies.
Apply and manage patches and updates in accordance with DoW and Navy patch management policies.
Manage automated installation methods and system imaging using tools such as SCCM, VMware, Nutanix, Satellite, and Ansible.
Perform system hardening, patching, and vulnerability remediation using tools such as ACAS, ESS, and SCAP.
Develop and maintain PowerShell scripts to automate administrative tasks and system configuration.
Support VMware and Hyper-V virtualization platforms and manage virtual infrastructure lifecycle.
Collaborate with cybersecurity teams on ATO packages, POA&Ms, and audit readiness.
Maintain system documentation, configuration baselines, and standard operating procedures.
Mentor 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.
Support backup and disaster recovery strategies using enterprise tools such as Veeam and Commvault.
Evaluate and recommend Linux technologies and DoW-approved tools to improve system performance and security.
Perform other duties as assigned.