Network System Administrator

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.