Information Systems Security Engineer- Top-Secret Clearance|Charleston, SC

We are currently seeking an Information System Security Engineer (ISSE) to support the Naval Information Warfare Center Atlantic (NIWC Atlantic) Expeditionary Enterprise Systems and Services (E2S2) Division in North Charleston, South Carolina. NIWC Atlantic provides design, acquisition, and sustainment services for Marine Corps Systems Command (MCSC) IT systems. This is a full-time CONUS position requiring an active Top Secret clearance. The base salary range for this role is approximately $103,000 to $121,000 annually. The final offer will be based on relevant experience, skills, internal equity, and market data. What You'll Do As an ISSE, you will integrate cybersecurity into system architectures throughout the system lifecycle, ensuring compliance with government policies, cybersecurity standards, and Risk Management Framework (RMF) requirements. You will partner with engineers, developers, architects, ISSM/ISSO personnel, and government stakeholders to deliver secure, resilient solutions supporting U.S. government missions. You will: • Integrate cybersecurity requirements into system architectures, engineering designs, interface specifications, and lifecycle documentation. • Engineer, implement, and validate controls under NIST RMF, NIST SP 800-53, CNSSI 1253, and DoD cybersecurity guidance. • Conduct architecture reviews, vulnerability assessments, threat and risk analyses, attack surface analyses, and mitigation planning. • Participate in design reviews, technical interchange meetings, and configuration control boards to incorporate cybersecurity from the outset. • Develop and maintain 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 authorization artifacts. • Identify security gaps and architectural risks and recommend practical engineering solutions. • Collaborate with engineering teams to establish and maintain secure configuration baselines. • Evaluate system changes, technology insertions, and architecture modifications for cybersecurity and accreditation impacts. • Analyze vulnerability scan results, prioritize findings, plan remediation, and validate corrective actions. • Participate in integration, testing, verification, validation, and accreditation activities to confirm security controls perform as intended. • Assess control effectiveness through continuous monitoring and recommend 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 You'll Bring Required Qualifications: • Education & Experience: Bachelor's degree in Cybersecurity, Computer, Electrical, or Electronics Engineering, or Mathematics with a concentration in Computer Science, or a related discipline; degree program must be ABET-accredited. • Minimum three (3) years of experience developing, implementing, and maintaining cybersecurity policies, including Assessment and Authorization (A&A) activities. • Technical Expertise: Demonstrated experience engineering NIST RMF controls and producing RMF artifacts. • Clearance: Must have a current and active Top Secret security clearance. • Certification: Must hold a DoD 8570/8140 Level I certification in IAM, IAT, or IASAE. Preferred (Nice to Have): • Experience supporting DoD, Intelligence Community, or other classified government systems. • 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 with vulnerability assessment tools such as ACAS, Nessus, or SCAP. • Experience with cloud security, hybrid environments, containers, Kubernetes, or DevSecOps pipelines. • Familiarity with PowerShell, Python, Ansible, Terraform, the DoD Enterprise DevSecOps Reference Design, or Platform One. • Additional security certifications such as Security+, CISSP, CASP+, CCSP, GIAC, or IASAE. • Strong technical writing and verbal communication skills for technical and leadership audiences. • Experience with large-scale defense, intelligence, or space systems, including ground infrastructure, mission operations, networks, cloud, or enterprise IT. Travel Requirements Travel requirements, if any, will be communicated during the hiring process. Physical & Work Environment Requirements • Periods of prolonged sitting and/or standing, including desk-based computer work. • Travel between work locations, including company offices, customer sites, and government installations, as required. • Occasional extended work hours, including evenings or weekends, as needed. • Work may be performed in a secure facility where personal electronic devices may be restricted. • Communication with team members, customers, and stakeholders through verbal and written methods. • Ability to manage competing priorities, work under deadlines, and maintain attention to detail. Background & Security • Employment is contingent upon successful background investigation. • Alcohol and drug screening may be required for federal contract compliance. Benefits & Perks We believe in investing in our team-both professionally and personally: • Medical, dental, vision, life, accident, and critical illness insurance • 401(k) immediate vesting and match • Paid time off and company holidays • Generous tuition and training support • Employee referral program • Access to Tickets at Work, EAP, wellness initiatives, and more Join Us If you're driven by mission, technology, and teamwork-we want to hear from you. Cambridge is growing, and this position is just one of many opportunities on our global team. Know someone perfect for the role? Referrals are welcome-both employees and non-employees may qualify for a bonus. Apply today and help strengthen cybersecurity for national security missions.