Information Systems Security Officer

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

Job Title: Information Systems Security Officer

Job Category: Security

Time Type: Full time

Minimum Clearance Required to Start: Top Secret

Employee Type: Regular

Percentage of Travel Required: None

Type of Travel: None

The Opportunity

CACI is seeking a experienced Information System Security Officer (ISSO) to support a mission-critical program for the National Geospatial-Intelligence Agency (NGA). In this role, you will serve as the primary point of contact for security matters related to assigned information systems, ensuring they are operated, maintained, and disposed of in accordance with applicable security policies, procedures, and the Risk Management Framework (RMF). You will work closely with system owners, ISSMs, government stakeholders, and technical teams to maintain a strong security posture across the program, support continuous monitoring efforts, and help ensure systems maintain their Authorization to Operate (ATO). This position offers the opportunity to directly support national security missions in a fast-paced, geospatial intelligence environment.

Responsibilities

• Serve as the ISSO for one or more assigned information systems, acting as the liaison between system owners, ISSMs, and the Authorizing Official (AO)
• Support the full RMF lifecycle: categorization, control selection, implementation, assessment, authorization, and continuous monitoring
• Prepare, update, and maintain security authorization artifacts, including System Security Plans (SSPs), risk assessments, contingency plans, and Plans of Action and Milestones (POA&Ms)
• Conduct and support periodic security control assessments, vulnerability scans, and audits; track remediation of findings
• Monitor systems for security-relevant events and respond to/report security incidents in accordance with agency policy
• Ensure systems are operated in compliance with NGA, DoD, and IC security policies (e.g., ICD 503, NIST SP 800-53, CNSSI 1253)
• Support configuration management processes, including review of proposed system changes for security impact
• Maintain user access controls, including account management, least privilege, and periodic access reviews
• Support account audits, media protection, and system hardening activities (e.g., STIG compliance)
• Coordinate with the ISSM and government customer to maintain and renew system Authorizations to Operate (ATOs)
• Deliver regular status reports and briefings to program leadership and government stakeholders on the security posture of assigned systems

Qualifications

Required Qualifications

• Active Top Secret clearance with the ability to obtain/maintain SCI and polygraph
• DoD 8570/8140 IAM Level II certification (e.g., Security+, CySA+, CAP, or equivalent)
• 3+ years of experience as an ISSO or in a similar cybersecurity role supporting DoD/IC systems
• Working knowledge of the Risk Management Framework (RMF) and NIST SP 800-53 controls
• Experience preparing or maintaining security authorization documentation (SSPs, POA&Ms, contingency plans)
• Familiarity with STIGs, ACAS/Nessus scanning, and vulnerability remediation processes
• Strong written and verbal communication skills, with the ability to interface directly with government customers
• Bachelor's degree in a related field or equivalent combination of experience and training

Desired Qualifications

• Experience supporting NGA or other NGA/IC customer environments specifically
• AWS certification (e.g., AWS Certified Cloud Practitioner or higher) and hands-on experience securing cloud-hosted systems
• Experience with Momentum Financials (Unison/CGI) in a security support or system administration capacity
• CISSP or other DoD 8570 IAM Level III certification
• Experience with Xacta, eMASS, or similar RMF/GRC tools
• Familiarity with container/cloud security practices and continuous ATO (cATO) concepts
• Prior experience supporting a geospatial intelligence, imagery, or mapping-related program

What You Can Expect

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you'll be part of a high-performing group dedicated to our customer's missions and driven by a higher purpose - to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The Proposed Salary Range For This Position Is

$75,200-$158,100

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.