Sr. Systems Administrator (Windows)

Amentum•Waimea, HI

3d•$135,000 - $150,000•Onsite

About The Position

Amentum is seeking a highly experienced Senior Microsoft System Administrator to oversee and manage enterprise-level Microsoft infrastructure supporting U.S. Navy operations in a Department of War (DoW) environment on Kauai, Hawaii. The role requires deep expertise in Microsoft systems, leadership in secure system administration, and working knowledge of the Risk Management Framework (RMF) and NIST SP 800-53 controls. The administrator will lead and support complex environments and help ensure cybersecurity compliance across classified and unclassified networks. The position requires a bachelor's degree in computer science or a related technical discipline, or a high school diploma or equivalent plus eight years of system administration experience. The posting lists a minimum of two years of system administration/IT experience and indicates that advanced certifications may substitute for a degree or experience. Required credentials include DoD 8570/8140 IAT II and one of the listed operating-system certifications. The candidate must be able to obtain and maintain a Top Secret U.S. Government clearance; U.S. citizenship is required for clearance eligibility. The stated compensation range is $135,000–$150,000. Benefits include health, dental, and vision insurance; paid time off and holidays; retirement benefits including 401(k) matching; educational reimbursement; parental leave; an employee stock purchase plan; tax-saving options; disability and life insurance; and pet insurance. Benefits may vary by employment type, location, and applicable agreements.

Requirements

Two years of system administration or IT experience; advanced certifications may be substituted for a degree or experience.
Bachelor's degree in computer science or a related technical discipline, or high school or equivalent with eight years of system administration experience in lieu of a bachelor's degree.
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.
DoD 8570/8140 IAT II certification.
One operating-system certification: Windows, Azure Administrator Associate (Exam AZ-104), or Windows Server Hybrid Administrator Associate (Exams AZ-800 and AZ-801).
Ability to obtain and maintain a Top Secret U.S. Government clearance; U.S. citizenship is required to obtain and maintain the clearance.
Must meet eligibility requirements for clearance before starting and maintain clearance for access to classified information or closed/restricted areas throughout employment.

Nice To Haves

Advanced knowledge and certification in both Windows Server and RHEL.

Responsibilities

Administer and maintain Microsoft Windows Server environments across classified and unclassified Navy networks.
Manage Active Directory, DNS, DHCP, and Group Policy Objects across multiple domains and enclaves.
Implement and maintain RMF security controls and ensure compliance with DISA STIGs and DoW cybersecurity policies.
Apply and manage patches and updates across Microsoft systems in accordance with DoW and Navy patch management policies.
Manage automated installation methods and system imaging, including tools such as MECM, VMware, and Nutanix.
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 and Configuration Management Boards.
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 Microsoft technologies and DoW-approved tools to improve system performance and security.
Perform other duties as assigned.