ISSO: RMF & ATO Specialist (Top Secret)

CACI International Inc; St. Louis (MO); On-site; USD 75,000 - 158,000; Full time

Job summary

CAC I International Inc is seeking an experienced Information System Security Officer (ISSO) to support a National Geospatial-Intelligence Agency program. You will serve as the primary security liaison for assigned information systems, ensuring RMF processes and ATO maintenance.

Join a mission-focused, high-security environment with DoD/IC policies, client government stakeholders, and a commitment to continuous monitoring and risk management for secure system operation.

Qualifications

• Active TS clearance with ability to obtain SCI and polygraph.
• DoD 8570/8140 IAM Level II certification.
• 3+ years of ISSO or DoD/IC cybersecurity experience.
• RMF knowledge and NIST SP 800-53 controls.
• Experience preparing security documentation (SSPs, POA&Ms).
• Familiarity with STIGs, ACAS/Nessus, and remediation.
• Strong written and verbal communication with government customers.
• Bachelors degree or equivalent in a related field.

Responsibilities

• Serve as ISSO for assigned information systems and liaison between owners, ISSMs, and AO.
• Support RMF lifecycle: categorization, control selection, implementation, assessment, authorization, and continuous monitoring.
• Prepare and maintain security artifacts (SSPs, POA&Ms, contingency plans).
• Conduct security control assessments, vulnerability scans, and remediation tracking.
• Monitor security events and report incidents per agency policy.
• Ensure compliance with NGA, DoD, and IC policies (ICD 503, NIST SP 800-53, CNSSI 1253).
• Coordinate with ISSM and government customer to renew ATOs.
• Deliver status reports and briefings to program leadership.

Skills

RMF knowledge

NIST SP 800-53

DoD 8570/8140 IAM Level II

Vulnerability remediation

ACAS/Nessus

Communication skills

System security

DoD/IC liaison

Education

Bachelor's degree or equivalent

Tools

SSP

POA&Ms

STIGs

eMASS

XACTA

C&A tools

Job description

CAC I International Inc is seeking an experienced Information System Security Officer (ISSO) to support a National Geospatial-Intelligence Agency program. You will serve as the primary security liaison for assigned information systems, ensuring RMF processes and ATO maintenance.

Join a mission-focused, high-security environment with DoD/IC policies, client government stakeholders, and a commitment to continuous monitoring and risk management for secure system operation.