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Markon

Information Systems Security Engineer

Markon

. Lead Information Systems Security Engineering (ISSE) activities throughout the system lifecycle .

Posted 10/28/2026full-timeChantilly • Virginia • United StatesMid-LevelSenior💰 $175,000 - $205,000 per yearWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in Information Systems Security Engineering (ISSE), including security architecture, vulnerability management, and data flow solutions within classified environments. Proficient in developing ETL pipelines and utilizing Neo4j graph databases to support advanced analytics and AI/ML initiatives.

Highest-signal resume keywords
Information Systems Security Engineering (ISSE)Assessment and Authorization (A&A)ETL Pipeline DevelopmentNeo4j Graph Database SolutionsActive TS/SCI Clearance with Full Scope Polygraph (FSP)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Security ArchitectureVulnerability ManagementCypher ProgrammingPython ProgrammingJava ProgrammingJavaScript ProgrammingData ModelingData AnalysisContinuous MonitoringRisk Analysis
Soft Skills
Strong Written CommunicationStrong Verbal Communication
Tools & Technologies
Neo4jCloud ArchitecturesAgile DevelopmentCI/CD ProcessesData Visualization Tools
Industry Keywords
NIST ComplianceAuthorization to Operate (ATO)Classified EnvironmentsData GovernanceAI/ML Initiatives

Tech Stack

Tools & technologies
CloudETLJavaJavaScriptNeo4jPythonTypeScript

About the role

Key responsibilities & impact
  • Lead Information Systems Security Engineering (ISSE) activities throughout the system lifecycle
  • Develop security architectures and implement security controls compliant with NIST and Sponsor-specific requirements
  • Develop and maintain Assessment and Authorization (A&A) documentation supporting Authorization to Operate (ATO), including SSPs, POA&Ms, test procedures, and continuous monitoring artifacts
  • Conduct security scans, vulnerability assessments, patch management, and remediation across classified cloud and on-premises environments
  • Integrate security-by-design principles into system architectures, data flows, ETL pipelines, and operational workflows
  • Design, develop, and optimize ETL pipelines supporting enterprise data integration, advanced analytics, and AI/ML initiatives
  • Develop and maintain Neo4j graph database solutions, including data modeling, relationship mapping, schema optimization, and Cypher query development
  • Clean, preprocess, analyze, and visualize medium-to-large datasets for mission analysis and operational decision-making
  • Develop secure software components using Cypher, Python, Java, and JavaScript
  • Perform technical and functional assessments, risk analysis, cost estimation, trade studies, and systems engineering evaluations
  • Support secure cloud architectures, virtualization technologies, and scalable data solutions within mission environments
  • Collaborate with systems engineers, developers, security teams, and mission stakeholders
  • Participate in Agile development activities, including sprint planning, iterative development, and CI/CD processes
  • Maintain comprehensive technical, data, engineering, software, and security compliance documentation

Requirements

What you’ll need
  • Active TS/SCI clearance with Full Scope Polygraph (FSP)
  • Bachelor's degree and at least 8 years of relevant experience, including 2 years of Sponsor experience; OR Master's degree and at least 6 years of relevant experience, including 2 years of Sponsor experience; OR PhD and at least 3 years of relevant experience, including 2 years of Sponsor experience
  • An additional 4 years of relevant experience may be considered in lieu of a degree
  • Experience designing, securing, and maintaining data flow solutions within classified or high-security environments
  • Strong ISSE experience, including security architecture, A&A/ATO processes, vulnerability management, accreditation documentation, and continuous monitoring
  • Hands-on experience developing ETL pipelines, data models, activity models, and data engineering solutions supporting AI/ML initiatives
  • Proficiency in at least one programming language, such as Cypher, Python, Java, or JavaScript
  • Experience with graph database technologies; Neo4j and Cypher expertise preferred
  • Experience cleaning, modeling, analyzing, and visualizing medium-to-large datasets
  • Experience supporting Sponsor mission systems or classified programs
  • Strong written and verbal communication skills with the ability to explain complex technical concepts to technical and nontechnical stakeholders
  • Desired: experience with enterprise data strategy, data governance, data stewardship, and metadata management
  • Desired: experience developing dashboards, technical visualizations, or system-level data representations
  • Desired: exposure to AI/ML and large language model (LLM) systems and associated data engineering workflows
  • Desired: familiarity with Agile development methodologies and cloud-native architecture patterns
  • Desired: hands-on experience with Neo4j graph databases and advanced Cypher query development

Benefits

Comp & perks
  • Opportunities for personal and professional transformation
  • Employee growth and professional development support
  • Employee well-being support
  • Collaborative workplace environment
  • Equal Opportunity/Affirmative Action employment