Information Systems Security Engineer

Markon

Information System Security Engineer performing ISSE activities throughout the system development lifecycle for Markon. In-depth knowledge of secure systems engineering, firewall administration, and cybersecurity practices are required.

Posted 6/10/2026full-timeChantilly • Virginia • 🇺🇸 United StatesMid-LevelSenior💰 $150,000 - $180,000 per yearWebsite

Tech Stack

Tools & technologies

CloudCyber SecurityTypeScript

About the role

Key responsibilities & impact

Perform Information System Security Engineering (ISSE) activities throughout the system development lifecycle in accordance with NIST SP 800-160, NRO RMF requirements, and applicable cybersecurity directives.
Capture, refine, and document information protection requirements and ensure their integration into system acquisitions, engineering activities, and development efforts.
Integrate security functional requirements into acquisition lifecycle phases, program milestones, engineering documentation, and system development processes.
Assess cybersecurity risks, identify mitigation strategies, evaluate residual risk, and provide risk-based recommendations to stakeholders.
Support Risk Management Framework (RMF) activities, including system categorization, control implementation, assessment support, authorization support, and continuous monitoring activities.
Develop and maintain cybersecurity documentation supporting RMF and Assessment & Authorization (A&A) activities, including System Security Plans (SSPs), Security Assessment Reports (SARs), Plans of Action and Milestones (POA&Ms), risk assessments, and related artifacts.
Evaluate proposed system changes, technology integrations, and engineering solutions to determine cybersecurity impacts and recommend appropriate security requirements.
Support the design, development, implementation, integration, and sustainment of secure information systems and information assurance architectures.
Analyze system and network architectures to identify security requirements and recommend protections that support confidentiality, integrity, availability, authentication, and non-repudiation.
Recommend security architectures and engineering solutions that align with mission objectives, performance requirements, and cybersecurity best practices.
Conduct technical assessments to identify vulnerabilities, threats, and risks affecting enterprise, cloud, network, and mission systems.
Support vulnerability management activities, including vulnerability analysis, remediation planning, risk evaluation, and implementation of corrective actions.
Assess and recommend security controls, common controls, and compensating controls to address identified security requirements and risks.
Support the integration and implementation of Cross Domain Solutions (CDS) and coordinate with relevant stakeholders to ensure compliance with organizational processes and authorization requirements.
Apply Information Assurance (IA) and cybersecurity principles in support of enterprise IT systems, communications systems, cloud environments, and mission networks.
Support configuration management activities to maintain the security posture of hardware, software, operating systems, applications, and infrastructure components.
Participate in system testing, integration testing, security validation activities, and engineering reviews to verify security requirements have been properly implemented.
Collaborate with system engineers, program managers, security control assessors, authorizing officials, and other stakeholders to support system authorization and cybersecurity objectives.
Research emerging cybersecurity threats, vulnerabilities, technologies, and countermeasures and provide recommendations to improve system security and resiliency.
Participate in Integrated Product Teams (IPTs), engineering working groups, cybersecurity reviews, and technical forums to support mission and program objectives.
Support resilient system design and cybersecurity best practices that enable systems to operate through disruption, degradation, or hostile activity.

Requirements

What you’ll need

An Active TS/SCI with a Counter Intelligence Poly (highly preferred from this client)
Bachelor's degree in Computer Science, Cybersecurity, Information Assurance, Information Systems, Computer Engineering, or a related technical field.
Minimum of three (3) years of experience supporting Information System Security Engineering (ISSE), cybersecurity engineering, information assurance, risk management, or related cybersecurity disciplines.
Current Information Assurance Management (IAM) Level II or equivalent qualifying certification in accordance with contract requirements.
Experience supporting cybersecurity activities throughout the system development lifecycle.
Knowledge of Risk Management Framework (RMF), NIST cybersecurity guidance, and Assessment & Authorization (A&A) processes.
Knowledge of cybersecurity principles, information assurance concepts, systems security engineering methodologies, and secure system design practices.
Experience evaluating security requirements, implementing security controls, and supporting cybersecurity compliance efforts.

Benefits

Comp & perks

Medical
Dental
Vision
Life Insurance
Short-Term Disability
Long-Term Disability
401(k) match
Flexible Spending Accounts
EAP
Training and Tuition Assistance
Paid Time Off
Holidays

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Information System Security Engineering (ISSE)cybersecurity engineeringrisk managementvulnerability managementsecurity assessmentsystem development lifecyclesecurity controls implementationconfiguration managementsecure system designcybersecurity documentation

Soft Skills

collaborationcommunicationanalytical thinkingproblem-solvingstakeholder engagementtechnical assessmentrisk evaluationrecommendation developmentteam participationadaptability

Certifications

Active TS/SCI with Counter Intelligence PolyBachelor's degree in Computer ScienceBachelor's degree in CybersecurityBachelor's degree in Information AssuranceBachelor's degree in Information SystemsBachelor's degree in Computer EngineeringInformation Assurance Management (IAM) Level II