Senior ISSE: Cloud Security & RMF Architect

CACI International Inc; Chantilly (VA); On-site; USD 121,000 - 266,000; Full time

Job summary

CAC I International Inc. is seeking a Sr. Staff Information Systems Security Engineer (ISSE) to lead RMF/ATO activities and oversee security for cloud and on‑prem environments.

You will collaborate with developers, systems engineers, and government stakeholders to maintain Authority to Operate and ensure mission-critical system resilience. The role requires a TS/SCI with Poly clearance and 10+ years in cybersecurity, with hands-on experience in RMF, NIST controls, and cloud security, plus strong

Qualifications

• Bachelor’s Degree in Computer Science, Information Technology, Cybersecurity, Engineering, or related degree.
• Minimum of 10+ years of progressive experience in Cybersecurity, Information Assurance, or related background.

Responsibilities

• RMF & ATO Management: Lead the end-to-end Risk Management Framework (RMF) process, managing NIST 800-53/171 control sets and coordinating with cybersecurity entities to secure and maintain Authority to Operate (ATO).
• Security Engineering & Cloud Oversight: Drive "security by design" by reviewing technical change requests, evaluating new technologies, and providing security oversight for cloud-based platforms (AWS/Azure).
• Vulnerability & Risk Mitigation: Conduct system inspections and vulnerability assessments to manage POA&Ms, prioritize system patching, and ensure robust disaster recovery and contingency planning.
• Technical Compliance & Monitoring: Establish continuous monitoring protocols to track security posture, enforce cybersecurity policies, and brief complex technical risks to senior stakeholders.

Skills

RMF & ATO management

Security engineering

Cloud security

Vulnerability management

Continuous monitoring

Education

Bachelor’s Degree in Computer Science, Information Technology, Cybersecurity, Engineering, or related degree

Tools

NIST 800-53

NIST 800-171

Xacta

SNOW

Nessus

Splunk

Job description

CAC I International Inc. is seeking a Sr. Staff Information Systems Security Engineer (ISSE) to lead RMF/ATO activities and oversee security for cloud and on‑prem environments.

You will collaborate with developers, systems engineers, and government stakeholders to maintain Authority to Operate and ensure mission-critical system resilience. The role requires a TS/SCI with Poly clearance and 10+ years in cybersecurity, with hands-on experience in RMF, NIST controls, and cloud security, plus strong