Network System Administrator

General information

Requisition #

R71719

Locations

USA-CA-Los Angeles

Posting Date

10/29/2026

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) - II to join our team in El Segundo, CA.

The primary function of the Network/Systems Administrator-II is to work with Special Access Program (SAPs) and other classified networks supporting SSC Directorates and/or AFSPC Operational Units. The position will provide "day-to-day" support for Collateral, Sensitive Compartmented Information (SCI), and Special Access Program (SAP) activities. This role requires full-time, on-site presence five days a week.

Responsibilities include but are not limited to:

• 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 comprehensive system documentation.
• Interface directly with local customers to provide rapid technical support and resolve IT operational issues.
• Analyze and troubleshoot system anomalies to ensure optimum hardware and network performance.
• Perform scheduled maintenance, hardware replacements, firmware updates, and baseline configuration modifications.
• Manage data backup libraries and execute scheduled backups, including media handling at local and off-site locations.

Minimum Qualifications:

• Bachelor's degree in a related technical field (or an additional 4 years of relevant experience in lieu of a degree).
• 3+ years of total system administration experience.
• 2 years supporting SCI or SAP environments.
• Active DoD 8570.01-M Information Assurance Technician (IAT) Level II certification (e.g., Security+ CE, CCNA, CySA+, or CND) or ability to obtain within 6 months of hire.
• Proven experience deploying, configuring, and maintaining secure Microsoft Windows network operating environments.
• Demonstrated technical capability troubleshooting network protocols, system anomalies, and hardware malfunctions.

Preferred Qualifications:

• Applicable Microsoft Certified Windows professional credentials aligned with enterprise operational requirements.
• Working knowledge of JAFAN 6/0, DCID/JAFAN 6/3, DCID/JAFAN 6/9, and Joint DODIIS/Cryptologic SCI standards.
• Practical experience with PL1 and PL2 systems, as well as PL3 and PL4 cross-domain solutions.
• Familiarity with LAN/WAN infrastructure and COMSEC integration practices.

Clearance Requirements:

• An active TS/SCI or TS with SCI eligibility.
• Candidates must be eligible for access to Special Access Programs.
• Willingness to submit to a polygraph is required.

Physical Requirements:

• Must be able to remain in a stationary position for extended periods in closed-area office environments.
• Must be able to occasionally move about inside the office to access safes, file cabinets, and server racks.
• Must be able to lift, move, and install computer and IT-related equipment weighing up to 50 lbs.
• Requires travel within the organizational Area of Responsibility (AOR), which may include both air and ground transportation.

The projected compensation range for this position is $107,900.00-$179,400.00. 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 careers@mantech.com and provide your name and contact information.