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 ToInstall, 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 QualificationsBachelor’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 experience4+ 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 QualificationsWorking 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 RequirementsAn 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 RequirementsMust 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.