Information Systems Security Engineer (ISSE) - Sr

Job order - J1225-1901 - Permanent Full Time Title Information Systems Security Engineer (ISSE) - Sr Category Cyber Security City Washington, District of Columbia, United States Job Description US CITIZENSHIP AND ACTIVE TOP SECRET CLEARANCE IS REQUIRED. CGI Federal is seeking a Senior Information Systems Security Engineer (ISSE) to support a major federal initiative. The Senior ISSE provides advanced cybersecurity engineering expertise, guiding secure system architecture, integrating NIST security controls, and ensuring secure design across complex hybrid cloud and on‑premises systems. This role serves as a technical lead, advising architects, developers, ISSOs, and federal stakeholders on secure system engineering practices, secure configuration management, and RMF engineering requirements. The Senior ISSE plays a critical role in system modernization, secure architecture reviews, and the engineering decisions that influence a system’s security posture across its full lifecycle. Responsibilities Lead the development, engineering, and review of secure system architectures across cloud, hybrid, and on‑prem environments. Design, implement, and validate NIST 800-53 security controls and system security features. Lead threat modeling, risk assessments, and advanced system security engineering reviews. Oversee secure configuration management, including STIG-based hardening, SCAP assessments, and enforcement of security baselines. Evaluate and recommend security technologies, tools, and design patterns to support mission needs and modernization efforts. Provide engineering leadership during RMF activities, including boundary definition, control inheritance, system architecture documentation, and ATO engineering support. Lead or support security functional testing, integration testing, and validation of implemented controls. Produce and review engineering documentation such as system design docs, interface control documents, data flow diagrams, and architecture diagrams. Guide cross-functional development, engineering, DevSecOps, and operations teams on secure integration practices. Mentor Mid-Level and Junior ISSEs; act as an escalation point for complex engineering and architecture challenges. Required Qualifications Bachelor’s degree in Cybersecurity, Information Systems, Computer Engineering, Software Engineering, or related technical field (Master’s preferred). Minimum of 7+ years of experience in cybersecurity engineering, systems engineering, or secure IT architecture, with demonstrable senior-level responsibility. Active Top Secret (TS) clearance (SCI preferred if applicable). Advanced experience with: Secure system and network architecture design NIST 800-53 control engineering & NIST 800-160 security engineering principles Secure configuration management and system hardening Cloud security engineering (AWS, Azure, GovCloud) Proven ability to lead engineering efforts across large, complex programs. Strong communication skills and proven ability to produce high-quality engineering documentation. Preferred Certifications Strongly Preferred: CISSP CASP+ CE CCSP GSEC Additional Highly Valuable: CISM CEH GCIH GCED AWS/Azure security architect certifications DoD 8140/8570 IASAE-II/III certifications Technical Familiarity Advanced use of STIG Viewer, SCAP Compliance Checker, and system hardening automation tools Vulnerability assessment tools such as ACAS/Nessus, Tenable, or equivalent Cloud security services (IAM, network security groups, key management, encryption, logging, etc.) Secure API design, data flow analysis, and integration of complex system interfaces DevSecOps pipelines and CI/CD security integration (Git, Jenkins, Azure DevOps, GitLab CI) Scripting or automation using Python, Bash, or PowerShell Ability to evaluate and guide complex architecture decisions across distributed systems US Citizenship Requirement Due to the nature of this government contract, US Citizenship is required. Only US citizens may apply. EEO Statement Qualified applicants will receive consideration for employment without regard to their race, ethnicity, ancestry, color, sex, religion, creed, age, national origin, citizenship status, disability, pregnancy, medical condition, military and veteran status, marital status, sexual orientation or perceived sexual orientation, gender, gender identity, and gender expression, familial status or responsibilities, reproductive health decisions, political affiliation, genetic information, height, weight, or any other legally protected status or characteristics to the extent required by applicable federal, state, and/or local laws where we do business. CGI provides reasonable accommodations to qualified individuals with disabilities. If you need an accommodation to apply for a job in the U.S., please email the CGI U.S. Employment Compliance mailbox at View email address on click.appcast.io. Your message will be routed to the appropriate recruiter who will assist you. #J-18808-Ljbffr