Information System Security Officer with Security Clearance

OverviewWe are seeking a Systems Security Engineer / Network Security Engineer to support mission-critical systems. This role focuses on Risk Management Framework (RMF) implementation, Authorization to Operate (ATO) support, and continuous monitoring across network, system, and application environments.The ideal candidate has hands-on experience with NIST 800-53 security controls, NIST 800-37, and federal system authorization processes, and is comfortable working with both technical teams and senior stakeholders in a regulated, classified environment. Key Responsibilities Implement and assess NIST 800-53 security controls across network, system, and application layersSupport RMF (NIST 800-37) activities for new and existing systemsDevelop, maintain, and update security documentation, including: System Security Plans (SSPs)Plans of Action and Milestones (POA&Ms) Support Authorization to Operate (ATO) packages and AO decision processesPerform risk and vulnerability assessments and identify security gaps and mitigation strategiesTrack and manage POA&M remediation activities in coordination with system ownersMonitor system security posture and support continuous monitoring and vulnerability managementAssess security impacts of system changes and support configuration and change management processesPrepare systems for security assessments, audits, and compliance reviewsImplement and enhance cybersecurity and infrastructure controls, including detection, event correlation, and vulnerability capabilitiesLeverage security telemetry, event data, and analytics to identify threats and indicators of compromiseCommunicate complex security concepts to technical teams, leadership, and senior managementServe as a security liaison between engineering teams, cybersecurity operations, and governance bodies Required Qualifications Active Top Secret (TS) clearanceExperience with NIST 800-53 security control implementation and assessmentExperience with NIST 800-37 Risk Management Framework (RMF)Experience supporting ATO and system authorization activitiesExperience developing and managing SSPs and POA&MsExperience with continuous monitoring, vulnerability management, and security complianceStrong collaboration and communication skills in a classified environmentEducation & Experience: HS diploma or GED with 8+ years of Information Assurance / Cybersecurity experienceORBachelor's degree with 5+ years of Information Assurance / Cybersecurity experience