Sr. Systems Administrator; Windows

Amentum is seeking a Sr.
Systems Administrator (Windows) for a position on Kauai, HI. Highly experienced Senior Microsoft System Administrator to oversee and manage enterprise-level Microsoft infrastructure in support of U.S. Navy operations within a Department of War (DoW) environment. This role requires deep technical expertise in
Microsoft 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.

• Administer and maintain Microsoft Windows Server environments in classified and unclassified environments across Navy networks.

• Manage Active Directory, DNS, DHCP, and Group Policy Objects (GPOs) across multiple domains and enclaves.

• 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 Microsoft systems in accordance with DoW and Navy patch management policies.

• Manage automated installation methods and system imaging (e.g., MECM, VMware, Nutanix)

• Perform system hardening, patching, and vulnerability remediation using tools such as ACAS, ESS, and SCAP.

• Develop and maintain Power Shell 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 Microsoft technologies and DoW-approved tools to improve system performance and security.

• Perform other duties as assigned.

• Lifting, Pushing/Pulling: 25 - 50lbs

• Work positions requirements: walking, standing, crawling, kneeling, cramped, sitting and work requiring repeated stooping or frequent climbing.

• Environment: customer contact, extended workday, confined work area, office laboratory, field assignment, and inclement weather.

• Two (2) years of System Administration/IT experience

• Advance certifications may be substituted for a degree or experience

• Proficiency in automation tools and scripting (e.g., Power Shell, Bash, Python)

• VMware/Nutanix certification

• Knowledge/Administration of Trellix, Log Rhythm, 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 in computer science or related technical discipline.

• 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
• One of the following OS Certifications required
• Windows
• Azure Administrator Associate (Exam AZ-104)
• Windows Server Hybrid Administrator Associate (Exam AZ-800 and AZ-801)

_ Preferred Qualifications _

• Advance knowledge and certification in both Windows Server and RHEL is considered highly desired

Security Clearance
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.

$135K…