Network Systems Administrator

General information

Requisition #

R69431

Locations

USA-CA-El Segundo

Posting Date

07/27/2026

Security Clearance Required

TS/SCI

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 Network System Administrator (NSA) - I to join our team in El Segundo, CA.

You will provide day-to-day support for Collateral, Sensitive Compartmented Information (SCI), and Special Access Program (SAP) activities supporting SSC Directorates and/or AFSPC Operational Units in a full-time, on-site environment.

Responsibilities:

• Install, maintain, audit, and support a secure MS Windows network environment and limited web/data application services.
• Maintain internet applications and protocols including IP, TCP, HTTP, HTTPS, FTP, and SSL.
• Maintain file servers, firewalls, network access, Security Monitoring Systems, and system documentation.
• Interface directly with local customers to provide technical IT support and quickly resolve system anomalies.
• Perform periodic maintenance, hardware upgrades, replacement, firmware updates, and system configuration changes.
• Manage data backup libraries, conduct scheduled tape backups, and maintain secure storage both on-site and off-site.
• Attend planning meetings with IT staff, Program Managers, and customers to prepare systems for operational use and support testing.

Minimum Qualifications:

• Bachelor's degree in a related field or 4 years of additional experience in lieu of a degree.
• 1+ years of total relevant IT experience
• Must meet DoD Directive 8570.01-M/8140 IAT Level II certification requirements (e.g., Security+ CE, CCNA, CySA+, CND) within 6 months of hire.
• Possess applicable Windows professional certifications based on operating system requirements for the supported organization.

Preferred Qualifications:

• 1 year of SCI or SAP experience highly desired.
• Thorough knowledge of Microsoft Windows Server, Microsoft Exchange Server, and Windows client operating systems and associated hardware.
• Working knowledge of LAN/WAN technologies, data backup systems, and COMSEC integration.
• Working knowledge of JAFAN 6/0, DCID/JAFAN standards, ICDs, and Joint DODIIS/Cryptologic SCI Information Systems Security Standards.
• Experience with PL1 through PL4 systems and cross-domain solutions.
• Strong ability to work independently in a dynamic environment with DoD, military, civilian, and industry partners.

Clearance Requirements:

• Current Top-Secret Clearance with SCI Eligibility
• Must be eligible for access to Special Access Programs (SAP).
• Must be willing to submit to a Counterintelligence polygraph.

Physical Requirements:

• Requires travel within the organizational Area of Responsibility (AOR), which may include both air and ground transportation.
• Must be able to lift up to 50 lbs.
• Must be able to remain in a stationary position 50% of the time in closed-area offices.
• Must be able to move about inside and outside the office to access files, cabinets, safes, and install or remove computer-related equipment.

The projected compensation range for this position is $71,400.00-$118,700.00. 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 careers@mantech.com and provide your name and contact information.