Sr. ISSO (Hybrid Remote - TS/SCI CI Poly)

Responsibilities: Lead RMF activities and support certification, accreditation, IATT, and ATO efforts. Conduct security assessments and evaluate system compliance with federal cybersecurity requirements. Develop and maintain SSPs, POA&Ms, Security Assessment Plans (SAPs), and accreditation artifacts within XACTA . Implement, assess, and validate NIST 800-53 security controls. Coordinate with engineers, developers, DBAs, system administrators, and testers to maintain system compliance. Support security assessment events, audits, and interactions with Authorizing Officials and Security Control Assessors. Monitor security posture and recommend risk mitigation and corrective actions. Apply Zero Trust security principles across enterprise and cloud-native environments. Conduct vulnerability analysis, remediation tracking, and continuous monitoring activities. Provide cybersecurity guidance to program stakeholders and technical teams. Qualifications: 18+ years of experience in cybersecurity, information assurance, systems security engineering, or related disciplines. Prior experience serving as an ISSO, ISSE, or cybersecurity lead supporting federal systems. Extensive experience with RMF, XACTA, ICD 503, NIST 800-53, SSPs, POA&Ms, and accreditation packages . Experience supporting IATT and ATO processes within government environments. Proficiency with Splunk and enterprise security monitoring solutions. Strong understanding of cybersecurity compliance, risk management, and security control implementation. Excellent communication, documentation, and stakeholder engagement skills. Clearance Requirement Active TS/SCI Clearance with Active Polygraph required. Certifications Current Security+ or equivalent DoD 8570/8140 IAT Level II/III certification required. Preferred Experience leading cybersecurity programs and compliance initiatives. Experience working directly with ISSMs, SCAs, System Owners, and Authorizing Officials. Knowledge of cloud-native cybersecurity architectures and security controls. Experience implementing Zero Trust architectures and security strategies. Experience supporting federal modernization, cloud migration, or enterprise transformation programs.