Information Systems Security Engineer (ISSE)

Entarian • North Charleston, SC

6d

About The Position

Entarian is seeking an experienced Information Systems Security Engineer (ISSE) to support the Naval Information Warfare Center Atlantic (NIWC Atlantic) Expeditionary Enterprise Systems and Services (E2S2) Division. NIWC Atlantic provides design, acquisition, and sustainment services for Marine Corps Systems Command (MCSC) information technology systems. The ISSE integrates cybersecurity into system architectures throughout the system lifecycle, ensuring compliance with government policies, cybersecurity standards, and Risk Management Framework (RMF) requirements. The role works closely with systems engineers, software developers, architects, ISSM/ISSO personnel, and government stakeholders to engineer secure, resilient solutions supporting mission objectives. The position is suited to someone experienced in large-scale defense, intelligence, or space system environments, including space systems, ground infrastructure, mission operations, networks, cloud environments, or enterprise IT capabilities.

Requirements

• Active Top Secret clearance.
• Bachelor’s degree in Cybersecurity, Computer, Electrical, or Electronics Engineering, or Mathematics with a concentration in Computer Science, or a related discipline; the degree program must be ABET-accredited.
• At least three years of experience developing, implementing, and maintaining cybersecurity policies, including Assessment and Authorization (A&A) activities.
• A DoD 8570/8140 Level I certification in IAM, IAT, or IASAE.

Nice To Haves

• Experience supporting DoD, Intelligence Community, or classified government systems.
• Demonstrated experience engineering NIST RMF controls and producing RMF artifacts.
• Strong understanding of secure systems engineering, defense-in-depth, Zero Trust architectures, and large-scale distributed systems.
• Experience with operating systems, networking, virtualization, cloud, IAM, encryption, and cybersecurity technologies.
• Experience conducting vulnerability assessments using ACAS, Nessus, SCAP, or similar tools.
• Experience supporting cloud security, hybrid environments, containers, Kubernetes, or DevSecOps pipelines.
• Familiarity with infrastructure-as-code or scripting using PowerShell, Python, Ansible, or Terraform, and with the DoD Enterprise DevSecOps Reference Design or Platform One.
• Active security certifications such as Security+, CISSP, CASP+, CCSP, GIAC, or IASAE.
• Strong technical writing and verbal communication skills, including the ability to convey complex cybersecurity concepts to technical and leadership audiences.

Responsibilities

• Integrate cybersecurity requirements into system architecture, engineering designs, interface specifications, and technical documentation throughout the lifecycle.
• Engineer, implement, and validate security controls in accordance with NIST RMF, NIST SP 800-53, CNSSI 1253, and DoD cybersecurity guidance.
• Conduct architecture reviews, vulnerability assessments, threat analysis, risk assessments, attack surface analysis, and mitigation planning.
• Participate in architecture reviews, design reviews, technical interchange meetings, and configuration control boards to ensure cybersecurity is incorporated from the start.
• Develop and maintain technical cybersecurity documentation, including SSPs, control implementation statements, security and network diagrams, interface documents, and engineering analyses.
• Support RMF activities, including SAPs, SARs, POA&Ms, continuous monitoring documentation, and other authorization artifacts.
• Identify cybersecurity gaps and architectural risks and recommend practical engineering solutions to strengthen the security posture.
• Collaborate with engineering teams to establish and maintain secure configuration baselines.
• Evaluate system changes, technology insertions, and architecture modifications for cybersecurity impacts and accreditation implications.
• Support vulnerability management by analyzing scan results, prioritizing findings, planning remediation, and validating corrective actions.
• Participate in integration, testing, verification, validation, and accreditation activities to ensure security controls perform as intended.
• Support continuous monitoring by assessing control effectiveness and recommending improvements.
• Ensure secure integration of COTS, GOTS, open-source, cloud-based, and custom-developed technologies.
• Provide guidance on secure design, defense-in-depth, Zero Trust principles, and cybersecurity best practices.
• Prepare technical reports, engineering recommendations, risk assessments, and executive briefings.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level