Senior Systems Administrator

• 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.

MANTECH seeks a highly motivated and customer-focused Senior Systems Administrator to join our team in Annapolis Junction, MD., * 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)., * 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.
• Proficiency with PowerShell, Bash, Python, BigFix Action Script, and BigFix Relevance language.
• Experience administering and maintaining McAfee ePolicy Orchestrator (ePO), WSUS, BigFix, and Red Hat Satellite servers.

Clearance Requirements:

• Must possess and maintain an active TS/SCI clearance with Polygraph.

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations; must be able to exchange accurate information in these situations.