Senior Information Systems Security Engineer

Description As a Senior Information Security Systems Engineer (ISSE) you will join a small team of security engineers providing Information Assurance (IA) Architecture Analysis and Security Engineering Support for the implementation and fielding of the National Leadership Command Capability in support of Nuclear Command, Control, and Communications (NC3), Continuity of Government (COG), and Senior Leader communications. The ISSE will perform in a consultant‑like role providing technical knowledge, expertise, and advice to our customer. Primary Responsibilities Conduct cybersecurity risk assessments and provide prioritized risk mitigation recommendations in support of the customer’s mission. Support the design, implementation, and operation of real‑time capabilities to discover, detect, analyze, and mitigate threats and vulnerabilities. Analyze candidate architectures by evaluating against defined security requirements to identify security gaps and provide a recommended mitigation strategy. Research and evaluate candidate emerging technologies to determine cybersecurity effectiveness. Aid stakeholders through the development, refinement, delivery, and implementation of innovative solutions and capabilities. Engage stakeholders to ensure security objectives, protection needs, security requirements and associated validation methods are defined. Validate and verify system security requirements definitions and analysis and establish system security design. Design, develop, implement, and/or integrate IA and security systems and components including those for networking, computing, and enclave environments, especially those with multiple enclaves and differing data protection/classification requirements. Assist architects and system developers in identifying and implementing appropriate information security functionality to ensure uniform application of agency security policy and enterprise solutions. Contribute to the security planning, assessment, risk analysis, risk management, certification, and awareness activities for system and networking operations. Review C&A documentation, providing feedback on completeness and compliance of its content. Qualifications Bachelor of Science degree from an accredited university ideally in Computer Science, Information Assurance, Information Security System Engineering or a related field with a minimum of 14 years of experience as an Information Systems Security Engineer (ISSE) or System Engineer on programs and/or contracts in the customer space. CISSP or CASP+ certification required. Confidence and ability to present briefings to senior‑level DoD officials in both prepared briefings and ad hoc discussions. Experience with the Risk Management Framework (RMF) and conducting cybersecurity risk assessments. Expertise in network technology and systems security engineering; experience identifying, researching, characterizing, and documenting security weaknesses related to operating systems, software applications, firmware, network hardware components, and network architecture design to identify protection needs and documented policies and procedures. Experience developing and documenting system security requirements and conducting requirements gap analysis. Experience with security monitoring and incident response capabilities. Experience with emerging technologies such as Zero Trust, Cloud Computing, etc. Knowledge of, and practical experience with, the NIST Special Publications 800 Series, CNSSI 1253, and DoD 8500. Ability to work independently within a schedule and with little direction. Clearance Required Active TS/SCI with polygraph. EEO Statement All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partnership status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories that are consistent with relevant laws. #J-18808-Ljbffr Leidos