Senior IT Systems Administrator

BAE Systems Plc-posted 22 days ago

$95,106 - $161,680/Yr

Full-time • Mid Level

Onsite • Nashua, NH

5,001-10,000 employees

Transportation Equipment Manufacturing

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BAE Systems is seeking a Senior Closed Area Systems Administrator to provide comprehensive technical and operational support for classified IT systems. This position requires a seasoned IT professional with expertise in managing complex, air-gapped systems and lab environments in accordance with DoD and Intelligence Community security requirements. You will be responsible for the configuration, maintenance, and monitoring of secure networks and systems, including Lab-in-a-Box (LIB) environments, virtualization platforms, endpoint protection, and logging/alerting tools. This position is 100% onsite within a closed, classified area. Some after-hours or weekend support may be required for maintenance windows or incident response. You must be able to lift equipment (up to 40lbs) and work within controlled environments.

Provide desktop systems administration, including imaging, configuration, troubleshooting, and secure application support.
Manage and monitor virtual server instances (e.g., VMware, Hyper-V), ensuring uptime, performance, and resource allocation.
Lead and track monthly OS and application patching across desktops and servers, ensuring full compliance with security baselines and STIGs.
Maintain domain health, DNS/DHCP, and group policy objects within Active Directory.
Support system logging, event correlation, and incident response efforts within the closed area.
Collaborate with ISSOs and security staff to ensure all system changes comply with RMF and local security policies.
Maintain thorough system documentation, configuration baselines, and change logs.
Support classified system accreditation activities and audits as needed.
Perform user account administration, group policy configuration, and role-based access control in Active Directory for a classified environment.

U.S. Citizenship as required by contract
Active Secret Security Clearance and CompTIA Security+ or equivalent DoD 8570 IAT Level II certification.
3-6 years of experience and a minimum of a high school diplomq (2+ years of experience with a degree) as a systems administrator.
Proficiency in Active Directory, including user/group management, OU structure, and GPOs.
Hands-on experience with desktop system support (Windows OS) and endpoint hardening.
Experience managing virtualized server environments (VMware or Hyper-V).
Familiarity with monthly patching procedures, SCCM/WSUS, and vulnerability remediation.
Strong documentation skills and familiarity with change/configuration management practices.
Perform user account administration, group policy configuration, and role-based access control in Active Directory for a classified environment.

Active U.S. TS/SCI Security Clearance.
2+ years of experience working in a classified environment
Experience with secure system build processes and STIG compliance.
Working knowledge of RMF, NISPOM, and JSIG/ICD 503 requirements.
Familiarity with backup and recovery tools in classified environments.
Exposure to scripting (PowerShell, Python, Bash) for automation and task optimization.
Experience supporting secure enclaves, air-gapped systems, or cross-domain solutions.

health, dental, and vision insurance
health savings accounts
a 401(k) savings plan
disability coverage
life and accident insurance
employee assistance program
a legal plan
discounts on things like home, auto, and pet insurance
paid time off
paid holidays
paid parental, military, bereavement, and any applicable federal and state sick leave
company recognition program to receive monetary or non-monetary recognition awards

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