Information System Security Officer

General information

Requisition # R62034 Locations USA-TX-San Antonio Posting Date 07/22/2025 Security Clearance Required TS/SCI w/ Poly Remote Type Onsite Time Type Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

Mantech seeks a motivated, career driven, and customer-focused Information System Security Officer (ISSO) to join our team in San Antonio, TX.
 

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
  
   

MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.