**Job Description** We put our customers first exemplified by our missions: We Protect Those Who Protect Us and We Innovate for Those Who Move the World. Sound like a team you want to be a part of? Come build your career with BAE Systems. **Position Summary** 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. In this position you will support both Linux and Windows OS with an emphanis on Linux. 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. Using your expertise you will help to mentor and guide junior System Administrators being a resource of knowledge and support as needed. 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. **In this Senior System Administrator opportunity you will make impacts in the following ways;** Proficiency in Active Directory, including user/group management, OU structure, and GPOs. Configure, deploy, and maintain Lab-in-a-Box (LIB) environments used in closed area testing and mission scenarios. Develop and execute system shutdown and secure wipe procedures, in accordance with DoD and agency guidelines. Lead and coordinate data spill containment, response, and remediation actions in classified environments. Operate and manage Nessus vulnerability scanning, assessment reporting, and risk remediation tracking. Maintain and support VMware-based virtual infrastructure, including host management and resource allocation. Operate and manage Veeam backup and recovery solutions for secure system images and restoration planning. Administer Trellix ePO (McAfee) for endpoint protection policy management, signature updates, and alert resolution. Perform domain controller maintenance, including replication, DNS/DHCP services, and health monitoring. Design, implement, and troubleshoot Group Policy Objects (GPOs) in Active Directory. Support Splunk operations, including forwarder management, dashboard/report creation, and log analysis for auditing and threat detection. Ensure all systems are compliant with applicable STIGs, RMF controls, and cyber hygiene policies. Maintain system documentation, configuration change records, and contribute to audit readiness. Collaborate with ISSOs/ISSMs, facility security, and other stakeholders to ensure secure and compliant operations. Administer patch management for RHEL-based Linux systems, including vulnerability scanning, patch deployment, and compliance validation. Install and configure Trellix (McAfee) Linux Agents for endpoint protection and ePO integration. Deploy and configure Splunk Universal Forwarders on Linux systems; manage log ingestion and index routing. **Required Education, Experience, & Skills** US Citizenship is required to working as part of these programs/site this position will supports as contractually required Active U.S. Secret Security Clearance and CompTIA Security or equivalent DoD 8570 IAT Level II certification. 5-7 years of experience (4 years of experience with a degree) as a system administrator. Direct experience configuring and managing Lab-in-a-Box (LIB) environments. Familiarity with data spill response protocols and secure system sanitization. Hands-on experience with Nessus, VMware vSphere, Veeam, and Trellix ePO. Strong Active Directory experience, including domain controller and GPO management. Working knowledge of Splunk in secure environments (including alerting and data retention strategies). Understanding of DoD and IC security standards, including RMF, NISPOM, and STIG compliance. Strong Experience with Red Hat Enterprise Linux (v6.8 through v8) Operating System. Strong command of Linux RHEL patching workflows and package management tools (e.g., YUM/DNF). Experience with Trellix/McAfee agent installation on Linux systems and ePO integration. **Preferred Education, Experience, & Skills** Active U.S. TS/SCI Security Clearance. 4 years of experience working in a classified environment Experience with system accreditation (e.g., SSP development, POA&M tracking). Familiarity with classified lab setups, test bed environments, or R&D support. Exposure to cross-domain solutions, enclave management, or SAP/SAR environments. Scripting experience (PowerShell, Python) to automate common sysadmin tasks. Experience supporting audit and inspection activities. **Pay Information** Full-Time Salary Range: $95106 - $161680 Please note: This range is based on our market pay structures. However, individual salaries are determined by a variety of factors including, but not limited to: business considerations, local market conditions, and internal equity, as well as candidate qualifications, such as skills, education, and experience. Employee Benefits: At BAE Systems, we support our employees in all aspects of their life, including their health and financial well-being. Regular employees scheduled to work 20 hours per week are offered: health, dental, and vision insurance; health savings accounts; a 401(k) savings plan; disability coverage; and life and accident insurance. We also have an employee assistance program, a legal plan, and other perks including discounts on things like home, auto, and pet insurance. Our leave programs include paid time off, paid holidays, as well as other types of leave, including paid parental, military, bereavement, and any applicable federal and state sick leave. Employees may participate in the company recognition program to receive monetary or non-monetary recognition awards. Other incentives may be available based on position level and/or job specifics. **Sr. Systems Administrator, Linux/Windows** **112862BR** EEO Career Site Equal Opportunity Employer. Minorities . females . veterans . individuals with disabilities . sexual orientation . gender identity . gender expression