Information System Security Officer

Mantech seeks a motivated, career-driven, and customer-focused Information System Security Officer (ISSO) to join our team in Annapolis Junction, MD. This position plays a critical role in supporting enterprise infrastructure capabilities for a global, mission-focused workforce. Supporting high-visibility Enterprise Infrastructure Services (EIS) organization, responsible for the delivery and security of MPO’s Enterprise Information Technology (EIT)—the foundation for enterprise-wide services. As an ISSO, you will work alongside customers, Integrated Product Teams (IPTs), and vendors to support the implementation and compliance of advanced EIT capabilities through Data Center & Compute Services. Responsibilities include, but are not limited to:Update and maintain hardware and software inventory records, including associated change logsSupport and coordinate Secure the Enterprise (STE) and Secure the Network (STN) activitiesReview and address Xacta notices and ensure compliance documentation is accurate and currentTrack, review, and resolve POAMs (Plan of Action and Milestones) related to IAVA/IAVAx findingsDevelop and maintain System Security Plans (SSPs) for both new and existing systemsAnalyze vulnerability scan results and collaborate with system owners to implement remediationLeverage sponsor tools such as Gatekeeper, Xacta, SEAR, and LatteArt in daily operations Minimum Qualifications:Bachelor’s degree with 10+ years of relevant ISSO experience OR 4 additional years of related experience as an ISSO might be substituted for a degreeExperience with Xacta, LatteArt and other sponsor toolsExperience managing POAMs, performing audit log reviews, and maintaining secure system inventoriesIAM I certification (DoD 8140 required upon start of employment.  Acceptable certifications include CAP/CND/Cloud+/GSLC/Security + CE/HCISSP/CASP+CE/CISM/CISSP/ or CCISO)Experience reviewing, preparing, and updating ATO packages in accordance with NIST Risk Management Framework and customer policy, procedures, and guidelines Preferred Qualifications:Knowledge of STE and STN processes and coordinationExperience with Gatekeeper, SEAR, SCANBOYDemonstrated experience in SSP development and incident response managementClearance RequirementsMust possess and maintain a current/active TS/SCI clearance with Polygraph Physical Requirements:Must be able to remain in a stationary position 50% of the timeOccasionally moves about inside the office to access file cabinets, office machinery, etc.Frequently communicates with co-workers, management, and customers, including delivering presentations. Must be able to exchange accurate information in these situations 

Created: 2025-07-22