Information System Security Officer with Security Clearance

MANTECH seeks a motivated, career driven, and customer-focused Information System Security Officer (ISSO) to join our team in Columbia, Maryland. You will play a critical role in supporting enterprise infrastructure capabilities for a global, mission-focused workforce. 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. You will manage cybersecurity documentation, assess system vulnerabilities, and support the Risk Management Framework (RMF) lifecycle in alignment with Sponsor policies. Responsibilities include, but are not limited to: * Update and maintain hardware and software inventory records, including associated change logs
* Support and coordinate Secure the Enterprise (STE) and Secure the Network (STN) activities
* Review and address Xacta notices and ensure compliance documentation is accurate and current
* Complete SEAR audit log records in accordance with Sponsor standards
* Track, review, and resolve POAMs (Plan of Action and Milestones) related to IAVA/IAVAx findings
* Develop and maintain System Security Plans (SSPs) for both new and existing systems
* Analyze vulnerability scan results and collaborate with system owners to implement remediation
* Leverage sponsor tools such as Gatekeeper, Xacta, SEAR, and LatteArt in daily operations
Minimum Qualifications: * Bachelor's degree with 12+ years of relevant experience OR associate's degree with 15 years of relevant experience OR high school diploma/GED with 20 years of relevant experience
* Experience with Xacta, LatteArt and other sponsor tools
* Experience managing POAMs, performing audit log reviews, and maintaining secure system inventories
* IAM 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)
Preferred Qualifications: * Knowledge of STE and STN processes and coordination
* Experience with Gatekeeper, SEAR, SCANBOY
* Experience with the Service Now (SNOW) platform Clearance Requirements: * Must 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 time
* Occasionally 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