Information System Security Engineer (ISSE)

Key Responsibilities

• Maintain and enhance the security posture of enterprise and cloud-based computing environments.
• Lead security accreditation efforts throughout the full system lifecycle in accordance with ICD 503 Rev. 4 and the Risk Management Framework (RMF).
• Develop, maintain, and update System Security Plans (SSPs) and other required security documentation.
• Partner with Information System Security Managers (ISSMs), engineers, and program leadership to ensure security compliance and accreditation readiness.
• Assess system risks, identify security gaps, and recommend mitigation strategies to maintain compliance.
• Interpret and apply Sponsor security policies, standards, and cybersecurity best practices.
• Support continuous monitoring activities and help ensure ongoing security compliance for mission systems.
• Collaborate with technical teams to integrate security requirements throughout the system development lifecycle.

Required Qualifications

• Senior-level experience supporting Information Systems Security Engineering activities.
• 5+ years of experience maintaining the security posture of enterprise and cloud computing environments.
• Experience managing security accreditation efforts under the ICD 503 Rev. 4 framework.
• Strong understanding of Sponsor information security policies and the Risk Management Framework (RMF).
• 5+ years of experience developing and maintaining System Security Plans (SSPs) and related security documentation.