Classified Systems Administrator

Leidos is seeking a Classified Area System Administrator to support secure IT operations for mission-critical government programs. In this role, you will manage and harden Windows and Linux systems, implement STIGs, and ensure compliance with security policies in classified environments. Responsibilities include account and access management, patching, troubleshooting, backup and recovery, and supporting accreditation and audit activities. You will collaborate with cyber, network, and engineering teams, document configurations, and assist users, while contributing to continuous improvement and high system availability., * Administer and secure Windows and Linux systems in classified environments

• Implement STIGs and maintain compliance with security and accreditation requirements
• Perform system patching, updates, and vulnerability remediation
• Manage user accounts, access controls, and permissions
• Monitor system performance and troubleshoot hardware/software issues
• Maintain backups, recovery procedures, and configuration documentation
• Support security audits, inspections, and incident response
• Collaborate with cyber, network, and engineering teams on system changes
• Provide technical support to users in classified areas
• Contribute to process improvement and automation of routine tasks

• Windows server administration
• Linux/UNIX administration
• System hardening and STIG implementation
• Active Directory and Group Policy
• Networking fundamentals (TCP/IP, DNS, DHCP)
• Security compliance and RMF/NIST standards
• Scripting (Power
• Shell, Bash, or Python)
• Virtualization (VMware, Hyper-V)
• Backup and recovery tools
• Monitoring and troubleshooting tools