SEO Keywords: Senior Security Control Assessor, SCAR, RMF, DoD RMF, A&A, Authorization to Operate, ATO, cybersecurity, GRC, eMASS, Xacta, NIST, FedRAMP, STIGs, cloud security, AWS, Azure, GCP, DevSecOps, CI/CD, risk assessment, POA&M, SAR, SAP, TS clearance, SCI eligible, Arlington VA, onsite cybersecurity jobs, federal cybersecurity, security architecture, enterprise security, AI/ML systems, defense technology. The Senior SCA will bring advanced cybersecurity assessment experience, deep knowledge of DoD RMF and NIST frameworks, and the ability to deliver independent risk determinations supporting cutting-edge AI/ML and data-driven mission systems.