Primary Responsibilities
Propose, coordinate, implement, and enforce information systems security policies, standards, and methodologies.
Maintain the operational security posture for information systems to ensure policies, standards, and procedures are established and followed.
Manage security aspects of information systems and perform daily security operations.
Evaluate security solutions to ensure they meet requirements for processing classified information and perform vulnerability/risk assessments to support certification and accreditation.
Provide configuration management for information system security software, hardware, and firmware, and manage changes to systems, assessing their security impact.
Prepare and review security documentation, including System Security Plans (SSPs) and Assessment and Authorization packages.
Manage and coordinate security authorization activities in accordance with Government regulations, Department of Defense and National Institute of Standards and Technology Risk Management Framework and standards, and customer-specific information security policies, processes, and procedures.
ISSE Job Summary
The Information Systems Security Engineer (ISSE) is crucial in designing, developing, and implementing secure information systems. The ISSE collaborates with architects and developers to integrate robust security measures into systems, ensuring they are resilient against threats and vulnerabilities. This role requires a deep understanding of security engineering principles and a proactive approach to risk management throughout the system lifecycle.
Primary Responsibilities
Perform and review technical security assessments to identify vulnerabilities and ensure compliance with information assurance (IA) standards and regulations.
Validate and verify system security requirements, establish system security designs, and integrate system security capabilities for various environments.
Build cybersecurity into systems deployed to operational environments, ensuring uniform application of security policies and enterprise solutions.
Assess and mitigate system security threats and risks throughout the program life cycle, contributing to security planning, assessment, risk analysis, and risk management.
Apply system security engineering expertise in areas such as system security design, life cycle, risk management, and security testing, using industry system security engineering methodologies.
Enforce the design and implementation of trusted relations among external systems and architectures and manage changes to systems while assessing security impact.
Support security authorization activities in accordance with Government regulations, Department of Defense and National Institute of Standards and Technology (NIST) Risk Management Framework (RMF) standards, and customer-specific information security policies, processes, and procedures.
Basic Qualifications
This posting is for multiple opportunities ranging in years of experience. Level of opportunity, including compensation, will be matched to a candidate’s experience
Bachelors Degree or Masters Degree in related field of study and 12 or more years of related experience. Candidates with out Bachelors Degrees will be considered on a case by case basis and will be required to have an additional 4 years of related information security experience.
Level 1 - Bachelors and 7-14 years of experience
Level 2 - Bachelors and 14-20 years of experience
Level 3 - Bachelors and 20 or more years of experience
DoD 8570 Certification compliance related to level of position. This could include one or more of the following IAT II, IAM I, II or III or IASAE I, II or III:
Security+, CISSP, CASP+ CE, ISSEP
Clearance Required: Must have an active TS/SCI with Polygraph.
This posting is for multiple opportunities ranging in years of experience. Level of opportunity, including compensation, will be matched to a candidate’s experience
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If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.
Original Posting
January 5, 2026
For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
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. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
