Network System Administrator

MANTECH•Los Angeles, CA

20h•$165,900 - $295,300•Onsite

About The Position

MANTECH seeks a motivated, career- and customer-oriented Network System Administrator-III to support Special Access Programs (SAPs) and other classified networks for Space Systems Command (SSC) Directorates and Operational Units. The position provides day-to-day administrative and technical support across Collateral, Sensitive Compartmented Information (SCI), and SAP activities in a full-time, on-site operational environment in El Segundo, California. The administrator installs, configures, audits, and supports secure Microsoft Windows operating environments, local file servers, network access controls, and limited web and data application services. The role maintains core network protocols and services, firewalls, and Security Monitoring Systems while keeping systems documentation complete. It also includes troubleshooting hardware and software, performing scheduled maintenance and backups, preparing classified IT systems for fielding, and supporting operational testing. The position works with customers, IT staff, and program managers during requirements and planning sessions, providing technical guidance. It also provides peer leadership, mentoring, and quality assurance reviews for junior team members to support operational readiness. The role requires an active Top Secret clearance with SCI eligibility, eligibility for SAP access, and willingness to submit to a Counterintelligence polygraph examination. Local and regional travel within the organizational Area of Responsibility is required.

Requirements

Bachelor’s degree in a related technical area, or an additional four years of related experience may be substituted for a degree.
Six or more years of total related experience.
Four or more years of relevant SCI or SAP computing-environment experience, including at least two years of direct SAP experience.
Active DoD Directive 8570.01-M Information Assurance Technician (IAT) Level II certification, such as Security+ CE, CCNA, CySA+, or CND, or ability to obtain it within six months of hire.
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.
Active Top Secret clearance with SCI eligibility required to start.
Eligibility for access to Special Access Programs (SAPs).
Willingness to submit to a Counterintelligence polygraph examination.
Ability to remain stationary 50% of the time in closed-area offices.
Ability to lift up to 50 pounds.
Ability to occasionally move inside and outside the office to access files, cabinets, or safes and install or remove computer-related equipment.
Ability to travel locally and regionally within the organizational Area of Responsibility via air and ground transportation.

Nice To Haves

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.

Responsibilities

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.