Senior Systems Administrator

MANTECH seeks a highly motivated and customer-focused Senior Systems Administrator to join our team in Annapolis Junction, MD.

The Senior Systems Administrator will administer AWS cloud services, manage enterprise Windows and Linux environments, implement rigorous security controls, and automate recurring operational tasks across critical infrastructure. This role supports the Enterprise Infrastructure Services (EIS) organization, which oversees MPO’s Enterprise Information Technology (EIT)—delivering the backbone IT platform for a global workforce dedicated to the defense of our Nation.

Responsibilities include but are not limited to:

• Deploy, configure, and maintain Tenable Nessus Security Center and vulnerability scanners across enterprise networks.
• Implement Ansible playbooks in Linux environments to automate administrative, maintenance, and operational tasks.
• Develop, implement, and maintain automation scripts in PowerShell, Bash, and Python to streamline recurring systems administration and operational workflows.
• Harden Windows and Linux operating systems in strict accordance with DISA STIGs, applicable security policies, and SELinux standards.
• Maintain patch management infrastructure and repositories, including WSUS, YUM, BigFix libraries, McAfee ePO, and Red Hat Satellite servers.
• Generate and analyze security vulnerability reports, remediate identified vulnerabilities, and manage enterprise endpoint security configurations.
• Administer and troubleshoot core directory and infrastructure services, including Active Directory, Group Policy Objects (GPOs), DNS, DHCP, and SSL/TLS certificates.

Minimum Qualifications:

• 20 years of experience as a Systems Administrator or Cloud Engineer
• Bachelor’s degree in Systems Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related professional engineering discipline from an accredited college or university (an additional five [5] years of systems engineering experience may be substituted for the degree).
• Must hold a DoD 8570/8140 IAT Level II certification (e.g., CompTIA Security+ or equivalent), or obtain it within 60 days of program start.
• Demonstrated hands-on experience administering and troubleshooting Windows Server and Linux operating systems.
• Demonstrated experience with enterprise patch management, software deployment, and endpoint management technologies (such as WSUS, BigFix, or Red Hat Satellite).

Preferred Qualifications:

• Experience deploying, configuring, and administering Tenable Nessus Security Center and Nessus scanners.
• Experience developing and maintaining Ansible playbooks for Linux automation and system configuration management.