Network System 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.
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MANTECH seeks a motivated, career and customer-oriented Network System Administrator-III to join our team in El Segundo, CA.
The Network/Systems Administrator-III supports Special Access Programs (SAPs) and other classified networks supporting Space Systems Command (SSC) Directorates and Operational Units. You will provide day-to-day administrative and technical support across Collateral, Sensitive Compartmented Information (SCI), and SAP activities in a full-time, on-site operational environment.
Responsibilities include but are not limited to:
- Install, configure, audit, and support secure MS Windows operating environments, local file servers, network access controls, and limited web/data application services.
- Maintain core network protocols and services (IP, TCP, HTTP, HTTPS, FTP, and SSL), firewalls, and Security Monitoring Systems while preserving complete systems documentation.
- Analyze, troubleshoot, and resolve hardware and software anomalies quickly to optimize equipment performance and satisfy local customer mission requirements.
- Perform scheduled maintenance routines, hardware upgrades, firmware updates, configuration changes, and routine system backups across on-site and off-site storage libraries.
- Prepare classified IT systems for operational fielding and assist with integrated operational test events.
- Interface with customers, IT staff, and program managers during requirements and planning sessions to provide dependable technical guidance.
- Provide peer leadership, mentoring, and quality assurance reviews for junior team members to maintain continuous operational readiness.
Minimum Qualifications:
- Bachelor’s degree in a related technical area; an additional 4 years of related experience might be substituted for a degree.
- 6+ years of total related experience
- 4+ years of relevant SCI or SAP computing environments (minimum 2 years of direct SAP experience).
- Active DoD Directive 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, and applicable Windows operating system professional certifications aligned with customer and mission requirements.
- Proven technical competency managing core networking protocols, enterprise system backups, and secure network infrastructure.
Preferred Qualifications:
- Working knowledge of Windows Server environments, enterprise messaging services, and integrated Local Area Network/Wide Area Network (LAN/WAN) architectures.
- Direct familiarity with JAFAN 6/0, DCID/JAFAN 6/3, DCID/JAFAN 6/9, and DODIIS/Cryptologic SCI standards, with experience handling PL1 through PL4 cross-domain solutions.
- Strong working background in DoD security manuals, ICD policies, and legacy system Certification and Accreditation (C&A) lifecycles.
Clearance Requirements:
- An active Top Secret clearance with SCI eligibility is required to start.
- Applicants must be eligible for access to Special Access Programs (SAPs).
- Must have a willingness to submit to a Counterintelligence polygraph examination.
Physical Requirements:
- Must be able to remain in a stationary position 50% of the time in closed-area offices.
- Must be able to lift up to 50 pounds.
- Need to occasionally move about inside and outside the office to access files, cabinets, or safes, and to install or remove computer-related equipment.
- Position requires local and regional travel within the organizational Area of Responsibility (AOR) via air and ground transportation.
The projected compensation range for this position is $165,900.00-$295,300.00. 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.