Information Systems Security Engineer (ISSE) (TS/SCI with Poly Required)

Job description

The ISSE will lead and execute security engineering activities across complex, enterprise-scale environments. This role requires deep technical expertise across infrastructure, platforms, and applications, combined with expert-level, hands-on experience implementing the NIST Risk Management Framework (RMF) within federal government environments. The ideal candidate is a technical practitioner, not just an advisor – someone who can design, implement, assess, and secure systems end-to-end while directly supporting system authorization, continuous monitoring, and risk-based decision-making. This role also serves as the technical focal point for all security incidents, leading triage, investigation, and resolution efforts in coordination with program and enterprise security teams. GCI embodies excellence, integrity and professionalism. The employees supporting our customers deliver unique, high-value mission solutions while effectively leverage the technological expertise of our valued workforce to meet critical mission requirements in the areas of Data Analytics and Software Development, Engineering, Targeting and Analysis, Operations, Training, and Cyber Operations. We maximize oppor...