Senior ISSO — TS/SCI/Poly Security Expert

ManTech International

United States

On-site

USD 120,000 - 180,000

Full time

14 days+

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Job summary

MANTECH seeks an Information System Security Officer (ISSO) to join our Chantilly, VA team performing security oversight, monitoring, and lifecycle governance for classified IS environments. You will coordinate with system owners and admins, run vulnerability scans, and maintain continuous authorization readiness.

Required TS/SCI with Poly, a cyber discipline degree, and hands-on ISSO experience in cleared facilities.

Qualifications

Bachelor's degree or higher in a cyber discipline with relevant ISSO duties.
Active TS/SCI clearance with Polygraph.
Experience with security tools like Nessus, Security Center, and NMAP.

Responsibilities

Ensure day-to-day implementation and monitoring of security configurations for each IS.
Verify security controls are implemented and operating during all IS lifecycle phases.
Develop and maintain system security documentation continuously.
Coordinate with system owner, admins, and IS security personnel.
Conduct vulnerability scans per risk assessment parameters.
Develop POAMs in response to vulnerabilities.
Manage risks to ISs and NRO assets and oversee POAM completion.
Coordinate system owner concurrence for corrective actions.
Monitor controls to maintain ATO for NRO ISs.
Upload security evidence to GRC for monitoring phase.
Report changes affecting authorization status to owner and ISSM.