Senior Cyber Security Engineer - RMF/ATO Expert (TS/SCI)

CACI International Inc; North Charleston (SC); On-site; USD 72,000 - 150,000; Full time

Job summary

CACI International Inc. is seeking a Cyber Security Engineer to design, implement, and maintain secure systems and networks.

You will work with development and IT teams to embed security best practices, assess risks, and support RMF authorization activities throughout the lifecycle. The ideal candidate has 5+ years in cybersecurity engineering, strong experience with vulnerability management (Nessus/ACAS), STIGs, and NIST guidances, and the ability to communicate security concepts to technical

Qualifications

• Bachelor’s degree in Cybersecurity, Computer Science, Information Technology or related field; 5+ years cybersecurity engineering experience.
• Active TS/SCI clearance to start is required; US Citizenship is required.
• Experience with RMF, ATO processes, STIGs and SRGs, eMASS/XACTA familiarity.

Responsibilities

• Translate RMF categorization results into implementable security requirements across hardware, software and networks.
• Develop and maintain security artifacts, diagrams, data flows, and PPSM registrations.
• Analyze Nessus/SCAP results and help resolve security controls and vulnerabilities.
• Provide A&A support across RMF lifecycle and continuous monitoring.
• Assist with STIG implementation, compliance verification and audit readiness.
• Offer security-focused guidance for network, infrastructure, and system architecture.
• Communicate technical risks clearly to technical and non-technical stakeholders.
• Collaborate with cross-functional teams to design secure architectures throughout the development lifecycle.
• Interpret vulnerability scans to guide remediation strategies.
• Recommend corrective actions to address RMF findings and strengthen controls.
• Maintain cybersecurity tools like Nessus, Tenable, ACAS; support build pipelines with security.

Skills

RMF/ATO

NIST SP 800-53

Vulnerability assessment

Nessus/Tenable

ACAS/SCAP

SIEM

Windows/Linux hardening

Documentation

Security engineering

Stakeholder communication

Education

Bachelor’s degree in Cybersecurity

Bachelor’s degree in Computer Science/Information Technology

Tools

Nessus

Tenable Security Center

ACAS

STIG

Job description

CACI International Inc. is seeking a Cyber Security Engineer to design, implement, and maintain secure systems and networks.

You will work with development and IT teams to embed security best practices, assess risks, and support RMF authorization activities throughout the lifecycle. The ideal candidate has 5+ years in cybersecurity engineering, strong experience with vulnerability management (Nessus/ACAS), STIGs, and NIST guidances, and the ability to communicate security concepts to technical