Senior Systems Administrator

MANTECH•Annapolis Junction, MD

11d•$128,000 - $214,400•Onsite

About The Position

MANTECH seeks a highly motivated and customer-focused Senior Systems Administrator to join its team in Annapolis Junction, Maryland. The role supports the Enterprise Infrastructure Services organization, which oversees MPO’s Enterprise Information Technology platform for a global workforce supporting national defense. The administrator will manage AWS cloud services and enterprise Windows and Linux environments, implement security controls, and automate recurring operational tasks across critical infrastructure.

Requirements

At least 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 years of systems engineering experience may substitute for the degree.
Hold a DoD 8570/8140 IAT Level II certification, such as CompTIA Security+ or equivalent, or obtain one within 60 days of program start.
Hands-on experience administering and troubleshooting Windows Server and Linux operating systems.
Experience with enterprise patch management, software deployment, and endpoint management technologies such as WSUS, BigFix, or Red Hat Satellite.
Must possess and maintain an active TS/SCI clearance with Polygraph.
Able to remain stationary 50% of the time; occasionally move about inside the office to access file cabinets and office machinery; and frequently communicate and exchange accurate information with coworkers, management, and customers, potentially including delivering presentations.

Nice To Haves

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.

Responsibilities

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 PowerShell, Bash, and Python automation scripts for recurring systems administration and operational workflows.
Harden Windows and Linux operating systems in 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 Active Directory, Group Policy Objects (GPOs), DNS, DHCP, and SSL/TLS certificates.
Administer AWS cloud services and enterprise Windows and Linux environments. The role description identifies these duties generally but does not provide further AWS-specific tasks.