Network System Administrator

MANTECH seeks a motivated, career and customer-oriented Network/System Administrator II to join our team in El Segundo, CA.The Network/System Administrator II will leverage their strong technical background to support Special Access Programs (SAPs) and other classified networks. You will provide essential day-to-day support for Collateral, Sensitive Compartmented Information (SCI), and SAP activities, ensuring secure and reliable operations within a dedicated office environment.Responsibilities include but are not limited to:Installing, maintaining, auditing, and supporting a secure MS Windows network environment and associated web/data application services.Maintaining file servers, firewalls, network access, and security monitoring systems while ensuring all system documentation remains current.Interfacing directly with local customers and program managers to provide rapid IT support and resolve technical issues during requirement meetings.Analyzing and troubleshooting system anomalies to ensure optimum equipment performance and minimal downtime for mission-critical systems.Performing periodic hardware upgrades, firmware updates, and system configuration changes to maintain robust system baselines.Managing data backup libraries and performing scheduled tape backups to include secure off-site storage as required.Preparing systems for operational use and providing technical guidance during operational tests to ensure all requirements are met.Minimum Qualifications:Bachelor’s degree in a related area additional 4 years of experience will be accepted in lieu of degree.3+ years of total experience.2+ years of relevant experience specifically supporting SCI or SAP environments.Must meet DoD Directive 8570.01-M IAT Level II certification requirements (e.g., Security+ CE, CCNA, or CySA+) within 6 months of hire.Experience with the installation and maintenance of secure MS Windows network environments and internet protocols like TCP/IP and HTTPS.Experience troubleshooting complex system anomalies and performing hardware/software configuration management tasks.Preferred Qualifications:Applicable Windows professional certifications based on specific organizational operating system requirements.Thorough knowledge of Microsoft Windows Server administration, Microsoft Exchange, and associated hardware.Working knowledge of LAN/WAN technologies, COMSEC integration, and data backup technologies.Familiarity with JAFAN 6/0, ICDs, and Joint DODIIS/Cryptologic SCI Information Systems Security Standards.Clearance Requirements:An active TS/SCI or TS with SCI eligibilityCandidates must be eligible for access to Special Access Programs.Willingness to submit to a polygraph is required.Physical Requirements:Must be able to remain in a stationary position 50% of the time.Needs to occasionally move about inside the office to access file cabinets, office machinery, and install computer equipment.Frequently communicates with co-workers, management, and customers, which may involve delivering presentations.Must be able to exchange accurate information in these situations.

Created: 2026-04-08