Senior Cyber Security Engineer

Leidos; Maryland; On-site; USD 131,000 - 237,000; Full time

Benefits offered by this job

Health and Wellness programs

Retirement benefits

Job summary

Leidos is seeking a Senior Cyber Security Engineer to join a focused team delivering IA architecture and security engineering for NC3, COG, and senior leader comms. You will assess risks, design, implement, and operate real-time security capabilities across enclaves, and guide architecture with DoD stakeholders.

Requires a Bachelor’s in a related field, 14+ years in ISSE/Systems Engineering, and an active TS/SCI with polygraph. Strong RMF, writing, and briefing skills are essential.

Qualifications

• Bachelor’s degree in a related field with extensive information systems security experience.
• Active TS/SCI with polygraph clearance required.
• Strong writing and briefing skills for senior DoD officials.
• Expertise in RMF, risk assessments, and cybersecurity controls.
• Experience with network and enclave security design and evaluation.

Responsibilities

• Conduct cybersecurity risk assessments and provide prioritized mitigation.
• Support real-time threat discovery, analysis, and mitigation efforts.
• Evaluate candidate architectures for security gaps and propose mitigations.
• Research emerging technologies to improve cybersecurity effectiveness.
• Assist stakeholders and ensure security requirements are defined and validated.

Skills

Risk assessments

Threat detection

Security engineering

RMF

DoD briefing

Education

Bachelor of Science in CS/IS

Job description

About Leidos

Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

As a Senior Cyber Security Engineer 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 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.
• Validates and verifies system security requirements definitions and analysis and establishes system security design.
• Designs, develops, implements and/or integrates IA and security systems and system components including those for networking, computing and enclave environment to include those with multiple enclaves and with differing data protection/classification requirements.
• Assist architects and systems developers in the identification and implementation of appropriate information security functionality to ensure uniform application of Agency security policy and enterprise solutions.
• Contributes to the security planning, assessment, risk analysis, risk management, certification and awareness activities for system and networking operations.
• Reviews C&A documentation, providing feedback on completeness and compliance of its content.

Clearance Required

Active TS/SCI with polygraph.

Qualifications

• Bachelor of Science degree from an accredited university ideally in Computer Science, Information Assurance, Information Security System Engineering or 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 with the customer space.
• CISSP OR CASP certification required.
• Strong writing skills.
• Confidence and ability to present briefing to senior level DoD officials in both prepared briefings and/or in ad hoc discussions.
• Expertise in the Risk Management Framework (RMF) and conducting cybersecurity risk assessments.
• Expertise in network technology and systems security engineering.
• Experience in identifying, researching, characterizing, and documenting security weaknesses related to operating systems, software applications, firmware, network hardware components, as well as 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.

Pay Range

Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers.

• Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

Commitment and Diversity

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 partner 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 consistent with relevant laws.