Information Security Systems Engineer

L3Harris Technologies

. Support engineering teams in defining, designing, implementing, documenting, testing, and sustaining security solutions on National Security Systems and systems engineered for government customers .

Posted 9/15/2026full-timeChantilly • Virginia • United StatesMid-LevelSenior💰 $106,500 - $197,500 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in implementing and assessing security controls, applying NIST Risk Management Framework, and managing security architectures for National Security Systems. Proficient in incident response, vulnerability management, and utilizing DevSecOps CI/CD pipelines for secure system development.

Highest-signal resume keywords

NIST Risk Management FrameworkActive Top Secret/SCI Security ClearanceDoD 8140.03 Level 3 or 4 CertificationSAST, Fortify/Coverity, GitLabCloud Environments and IaaS/PaaS/SaaS Implementations

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Security Control AssessmentSystem Security CategorizationVulnerability ManagementRisk Mitigation StrategiesIncident ResponseMalware AnalysisData Flow DiagramsSecurity Plans DocumentationContinuous Monitoring PlansSecurity Control Traceability Matrices

Tools & Technologies

DevSecOps CI/CD PipelinesTenable NESSUSSplunkFortifyCoverity

Certifications & Qualifications

Active Top Secret/SCI Security ClearanceDoD 8140.03 Level 3 or 4 Certification

Industry Keywords

NIST SP 800-37NIST SP 800-53NIST SP 800-171CNSSI 1253JSIGFIPSModel Based Systems EngineeringUMLSysMLUAF

Tech Stack

Tools & technologies

CloudSplunk

About the role

Key responsibilities & impact

Support engineering teams in defining, designing, implementing, documenting, testing, and sustaining security solutions on National Security Systems and systems engineered for government customers
Apply NIST RMF, NIST SP 800-37, 800-53, 800-171, CNSSI 1253, JSIG, and FIPS to certify and achieve system accreditations
Work with system developers and commercial product vendors to design and evaluate secure systems, networks, and database products
Perform incident response, cyber threat identification, defensive cyber operations coordination, malware analysis, supply chain risk management assessments, vendor provenance, and counterfeit detection
Write System Security Plans, Security Control Traceability Matrices, Continuous Monitoring Plans, Security Assessment Plans and Procedures, Security Concepts of Operations, and Plans of Action and Milestones
Implement and assess security controls, define security control baselines, apply controls to computing/network nodes, and verify implementation
Create data flow diagrams and interface control documents, perform trade studies, and conduct SAST for application security and STIG compliance
Generate summary reports within DevSecOps CI/CD pipelines
Define and manage system/security architectures, boundaries, vulnerability management, and risk mitigation/remediation strategies
Configure and use defense and assessment tools across on-premises data centers and secure cloud-based systems

Requirements

What you’ll need

Active Top Secret/SCI security clearance
Ability to obtain and maintain Special Access Program (SAP) clearance after hire
Bachelor’s Degree and a minimum of 6 years of prior relevant experience; or Graduate Degree and a minimum of 4 years of prior related experience; or, in lieu of a degree, minimum of 10 years of prior related experience
DoD 8140.03 Level 3 or 4 certification
Experience with NIST Risk Management Framework and related NIST publications
Knowledge of CNSSI 1253, JSIG, and FIPS
Experience implementing and assessing security controls
Experience with system security categorization and security control overlays
Experience with SAST, Fortify/Coverity, GitLab, and DevSecOps CI/CD pipelines
Experience defining and managing security architectures, vulnerability management, and risk mitigation/remediation strategies
Experience with cloud environments and IaaS/PaaS/SaaS implementations
Preferred: Model Based Systems Engineering using UML, SysML, or UAF
Preferred: Tenable NESSUS vulnerability analysis tools
Preferred: SEIM/audit reduction tools such as Splunk

Benefits

Comp & perks

Health and disability insurance
401(k) match
Flexible spending accounts
Employee Assistance Program (EAP)
Education assistance
Parental leave
Paid time off
Company-paid holidays
Reasonable accommodation for individuals with disabilities