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General information

Requisition #
R64554
Locations
USA-VA-Chantilly
Posting Date
12/02/2025
Security Clearance Required
TS/SCI
Remote Type
Onsite
Time Type
Full time

Description & Requirements

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

MANTECH is seeking 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:

  • Bachelor’s 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

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 presentation

MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.