Information System Security Engineer

  • MANTECH
  • Chantilly, Virginia
  • Full Time

MANTECH seeks a motivated, career and customer-oriented Information System Security Engineer (ISSE) to join our team in Chantilly, VA.

Responsibilities include but are not limited to:

  • Maintaining, updating, and configuring logging/auditing tools across Sponsor
    networks and ensuring all network defense capabilities are kept current, patched, and securely configured

  • Designing, testing, and integrating new security products as directed. Beta testing new capabilities when directed, and conducting software testing as
    required

  • Maintaining a robust library of documentation, to include network diagrams for cyber defense capabilities and sensors, and making documentation available to all personnel with appropriate need-to-know

  • Providing engineering support for all primary systems, such as network-based intrusion detection/prevention

  • Maintaining, updating, and conducting routine vulnerability scanning across all Sponsor networks

  • Ensuring all parts of the infrastructure are in compliance with patching/hardening
    requirements.

  • Maintaining system baselines and configuration management items, including security event monitoring policies.

  • Analyzing data flows into, out of, and across Sponsor networks to identify and rectify any security gaps

Minimum Qualifications:

  • Bachelors degree and at least 3 years of experience with Risk Management Framework, JSIG, or similar security frameworks

  • Department of Defense (DoD) 8570 Compliant, IAT Level III within 6 months of
    hire date

  • Experience with Splunk continuous monitoring

  • Must have the ability to work in a dynamic environment and effectively interact with numerous DOD, military/civilian personnel, and industry partners.

  • Strong Analytical and Critical Thinking Skills, Interpersonal and People Skills,
    Leadership Skills, Listening Skills, Multi-Tasking Ability, Communication Skills,
    Organizational Skills, and Presentation Skills.

Preferred Qualifications:

  • Experience with STIGs, EvaluateSTIG, ACAS, NESSUS, and other vulnerability compliance verification tools.

  • Experience with scripting languages (PowerShell), application development
    (Java, Perl, Python, .NET), databases and analytical tools

  • Experience with security and operational related use cases is desired

  • Experience with Microsoft and VMware environments

  • Experience with Linux systems administration.

Clearance Requirements:

  • Must have an active DoD TS/SCI with the ability to obtain a polygraph.

Physical Requirements:

  • The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations

Job ID: 513284532
Originally Posted on: 3/12/2026

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