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Network Systems Administrator

ManTech

El Segundo, CAFull-timeSeen todaySeen in employer's feed today

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At a glance

Compensation
No compensation found
Location
El Segundo, CA
Schedule
Full-time
Work Authorization
Not specified

Olive lists jobs from US employers, including remote roles you can work from the United States.

Requirements

Credentials this posting asks for.

IAT Level II CertificationWindows Professional CertificationsTop Secret clearance

Job overview

MANTECH seeks a Network System Administrator I to support secure networks and related activities for SSC Directorates and/or AFSPC Operational Units in El Segundo. The role provides day-to-day support for collateral, SCI, and SAP environments, including network maintenance, customer support, system configuration, backups, and operational testing. It is full-time and on-site.

Skills & qualifications

RequiredNice to have

Skills

Windows ServerMicrosoft Exchange ServerWindows Client Operating SystemsLAN/WAN TechnologiesData Backup SystemsCOMSEC IntegrationJAFAN StandardsDCID StandardsICDsJoint DODIIS StandardsCryptologic SCI Security StandardsPL1-PL4 SystemsCross-Domain SolutionsIndependent WorkLifting 50 Lbs

Qualifications

Bachelor's in Related Field or Equivalent Experience1+ Years Relevant IT ExperienceIAT Level II CertificationWindows Professional CertificationsTop Secret Clearance With SCI EligibilitySAP Access EligibilityCounterintelligence Polygraph1 Year SCI or SAP Experience

Full job description

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 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 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.

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 [email protected] and provide your name and contact information.

How this job compares

Set against the 729 open Network Administrator jobs on Olive Jobs, counted November 4, 2026.

Pay
  • This postingNot listed
  • California median$97–138K/yr40 salary ranges
  • US median$40–45/hr32 hourly ranges
Openings
Olive Jobs lists 50 open Network Administrator jobs in California and 729 across the US. 2% of them nationwide are listed as remote or flexible.
Hiring the most in California
Experience
This posting asks for at least 1 year of experience — less than three in four Network Administrator postings that state a minimum ask for (median 5 years, across 627 postings).
Education
123 of the 729 open Network Administrator jobs (17%) ask for a bachelor's degree or higher.

Counted across the open, public US postings on Olive Jobs on November 4, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.

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