Senior Systems Administrator

General Information

Requisition # R63583 Locations USA-MD-Patuxent River Posting Date 10/01/2025 Security Clearance Required Interim Secret Remote Type Onsite Time Type Full time

Description & Requirements

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator to join our team in Patuxent River, MD.  This is a full-time onsite position.
 

Responsibilities include but are not limited to:

• Create software applications, test and evaluate applications, and tweak and improve applications to make them user-friendly.
• Assist in the definition, development, testing, analysis, and maintenance of new or existing software applications in support of the achievement of business requirements. This may include writing, coding, testing, and analyzing software programs and applications
• Update software or enhance existing software capabilities. May work with computer hardware engineers to integrate hardware and software systems and develop specifications and performance requirements
• May maintain databases within an application area, working individually or coordinating database development as part of a team
• May deploy and administer on-premises systems (e.g. VMware, Horizon, ESXi, WYSE) with an emphasis on high availability, scalability, and cost optimization
• Develop and maintain automation scripts using tools like Terraform, Ansible, and PowerShell
• Collaboration with DevOps, software engineering, and security teams to optimize system performance and reliability

Minimum Qualifications:

• Master’s degree in technical or business discipline with 8+ years of system administration or similar work experience, or a Bachelor’s degree plus 12+ years of experience, or an Associates with 14+ years of system administration or similar experience may be substituted for the Master’s degree
• 5+ years of experience in systems administration/engineering of virtualization, High Performance Computing (HPC), storage, and networking
• Experience building and administering systems using Red Hat Enterprise Linux (RHEL) 8.10, Windows 11 Enterprise, and/or Windows Servers 2019/2022 Enterprise
• Experience administering VMware environments (vSphere, vCenter, ESXi, VMware Horizon VDI)
• Strong knowledge of cybersecurity compliance, including STIGs, ATO processes (RMF), and vulnerability management tools (e.g., Tenable Security Center, Nessus, and Evaluate-Stig)

Preferred Qualifications:

• Experience with DoD or Navy cybersecurity mandates and cross-domain solutions
• Certifications such as Linux+, Cisco CCENT, or Microsoft MCSA/MCSE
• Knowledge of COMSEC principles and training

Clearance Requirements:

• Must be a U.S. Citizen and possess a current and active Top Secret Clearance

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time.
• Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication.

The projected compensation range for this position is $125,500.00-$210,200.00. 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 International Corporation 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 careers@mantech.com and provide your name and contact information.