Senior Systems Administrator
Confirmed on the employer's own hiring board on Oct 30, 2026. First seen by Alion on Oct 30, 2026. ManTech scores A on the Alion truth index.
Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now-unleash your potential with MANTECH!
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.
- 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.
The projected compensation range for this position is $128,000.00-$214,400.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.
MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.
If you need a reasonable accommodation to apply for a position with MANTECH, please email us at [email protected] and provide your name and contact information.