IT Systems Administrator

IT Systems Administrator Amentum is seeking a driven and professional IT Systems Administrator to provide enterprise IT, network, systems administration, and technical support to the U.S. Pacific Command (US PACOM) Requirements and Resources Directorate (J8). The position supports mission-critical Department of War (DoW) information systems and networks in a classified operational environment for warfighter experimentation. The successful candidate will provide hands-on technical support for servers, workstations, networks, applications, and communications infrastructure; troubleshoot complex hardware and software issues; implement configuration and security requirements; and work closely with government personnel, military users, cybersecurity teams, and other technical organizations to maintain reliable and secure IT services. Assigned to MCAS Kaneohe Bay, Hawaii, the position directly supports the J83 Edge Theater Architecture (ETA) team and reports administratively to the Amentum Project Lead. Essential Responsibilities: Administer, operate, monitor, and maintain DoD enterprise IT systems, networks, servers, and end-user computing environments. Install, configure, upgrade, troubleshoot, and maintain Windows and/or other operating systems and associated applications. Support LAN/WAN, routing, switching, DNS, DHCP, Active Directory, virtualization, storage, and enterprise services. Diagnose and resolve complex hardware, software, network, and connectivity problems. Perform system configuration, account administration, access management, patching, backups, and system recovery. Support cybersecurity requirements, vulnerability remediation, security configuration, auditing, and system hardening. Maintain technical documentation, system diagrams, standard operating procedures, configuration records, and troubleshooting guides. Monitor system performance and availability and identify potential operational or security issues. Coordinate with cybersecurity, network operations, service desk, systems engineering, and infrastructure teams. Support implementation of approved technical solutions and changes in accordance with DoD policies and organizational procedures. Provide technical assistance to military, government civilian, and contractor personnel. Participate in incident response, problem management, change management, and continuity-of-operations activities. Provide after-hours, on-call, exercise, or operational support when required by mission requirements. Perform other IT duties as assigned in support of US PACOM mission requirements. Minimum Requirements: Bachelor's degree in Information Technology, Computer Science, Information Systems, Cybersecurity, Engineering, or a related technical field or equivalent combination of education, training, and experience. 3+ years of professional IT experience in systems administration, network administration, infrastructure support, enterprise IT, or a related discipline. Current Security+, CCNA, CySA+, CASP+/SecurityX, CISSP, or other DoD 8140-recognized certification appropriate to the position. (Cyber.mil) Demonstrated experience supporting Windows and/or other operating systems. Working knowledge of TCP/IP networking, DNS, DHCP, routing, switching, and network troubleshooting. Experience with Active Directory and enterprise user/account administration. Experience troubleshooting hardware, software, operating-system, and network problems. Ability to document technical issues, solutions, configurations, and procedures clearly. Ability to work independently and as part of a multidisciplinary technical team. Ability to communicate effectively with technical and non-technical personnel. Ability to work in a controlled classified environment and comply with DoD security requirements. Ability to obtain and maintain any additional certifications or qualifications required for the assigned DoD 8140/DCWF work role. Must have an active Top Secret security clearance, with SCI eligibility later during employment. Note: US Citizenship is required to obtain a Top Secret Clearance. Preferred Qualifications: 5+ years of IT experience supporting DoW, Joint, military, intelligence, or other federal environments. Experience supporting classified networks or systems. Experience with DISA security technical implementation guidance (STIGs). Experience with vulnerability scanning, remediation, and cybersecurity compliance. Experience with VMware or other enterprise virtualization technologies. Experience with Microsoft Active Directory, Group Policy, Windows Server, and Microsoft 365/enterprise collaboration technologies. Experience with enterprise network equipment, including routers and switches. Experience with network monitoring and management tools. Experience with backup, disaster recovery, and continuity-of-operations systems. Experience supporting enterprise ticketing and IT service-management processes. Experience working with ServiceNow or comparable IT service-management platforms. Experience with scripting or automation using PowerShell, Python, or similar tools. Current TS/SCI eligibility or access. Prior experience supporting a Combatant Command, Joint Staff, Service component, or other operational military headquarters is highly desirable. Familiarity with Joint, DoW, and US PACOM policies, procedures, and mission-support requirements. Compensation & Benefits HIRING SALARY RANGE: $140K - $160K (Salary to be determined by the education, experience, knowledge, skills, and abilities of the applicant internal equity, and alignment with market data.) This position includes a competitive benefits package. For more detailed information on our Benefits and what it is like to work for Amentum: please visit our careers site: Compensation Details: $140,000 - $160,000 The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws. Benefits Overview: Our health and welfare benefits are designed to support you and your priorities. Offerings include: Health, dental, and vision insurance Paid time off and holidays Retirement benefits (including 401(k) matching) Educational reimbursement Parental leave Employee stock purchase plan Tax-saving options Disability and life insurance Pet insurance Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits. Original Posting: 10/16/2026 - Until Filled Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs. Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters. Amentum