BAE Systems is seeking a proactive and detail-oriented Closed Area Systems Administrator to join our Information Technology team supporting classified environments. This individual will work with a dynamic team responsible for the configuration, maintenance, and security of IT systems housed in closed areas, supporting critical national defense programs. As a key member of the IT support organization, you will play a vital role in managing and maintaining classified computing infrastructure while ensuring strict adherence to security compliance requirements such as RMF, NIST 800-53, and JSIG. In this System Adminstrator II position supporting our closed areas you will make impacts in the following ways; • Perform user account administration, group policy configuration, and role-based access control in Active Directory for a classified environment. • 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. Additional information: • This role requires 100% onsite work in a secure, closed area-remote or hybrid options are not available • Work may occasionally require after-hours support for patching or security-related events • Must be capable of lifting/moving equipment (up to 40 lbs) and performing physical tasks within secure rooms This position will be posted for at least 5 calendar days. The posting will remain active until the position is filled, or a qualified pool of candidates is identified. Required Skills and Education • U.S. Citizenship. • Active Secret Security Clearance and CompTIA Security+ or equivalent DoD 8570 IAT Level II certification. • 3-6 years of experience (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. Preferred Skills and Education • 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.