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Network Security Engineer
Network Security Engineer-February 2024
Ashburn
Feb 10, 2026
About Network Security Engineer

  Network Security Engineer

  Job Category: Information Technology

  Time Type: Full time

  Minimum Clearance Required to Start: Secret

  Employee Type: Regular

  Percentage of Travel Required: Up to 10%

  Type of Travel: Local

  What You’ll Get to Do:

  CACI’s Agile Solution Factory (ASF) is currently seeking a Network Security Engineer for a vital role based in Ashburn and Chantilly, VA. This hybrid position forms a crucial part of our team engaged in cyber security support for the Department of Defense. The primary focus is on developing and managing a secure network supporting VOIP systems, particularly for unclassified systems handling Personally Identifiable Information (PII) and Protected Health Information (PHI), categorized as Controlled Unclassified Information (CUI).

  ASF is committed to fostering an environment of innovation and is in continuous search of professionals who can bring new ideas to address complex technical and procedural challenges. The candidate must be able to adapt and collaborate effectively with a team that is technically diverse and geographically dispersed.

  More About the Role:

  The role requires extensive expertise in network security engineering, particularly in building and configuring firewalls, developing security stacks, implementing endpoint protections, and hardening both physical and virtual systems. In-depth knowledge of securing VOIP technologies, especially in the context of handling CUI like PII and PHI, is crucial.

  Responsibilities include coordination with government customer security offices and managing Information Assurance (IA)-related tasks. The role also involves overseeing the design, development, and implementation of secure communication systems and facilities .

  Key duties involve ensuring compliance with Federal, DOD, and Army guidelines, managing security practices for securing VOIP networks Experience with Communications Security (COMSEC), familiarity with Command Cyber Readiness Inspections (CCRIs), and collaboration with Cyber Security Service Providers (CSSPs) is crucial.

  Responsibilities:

  Configuration and maintenance of security tools for VOIP systems.

  Hardening efforts for systems handling PII and PHI.

  Coordination with the Network Enterprise Center at Fort Belvoir for environmental security and integrity.

  Application of Computer Network Defense (CND) skills in system management.

  Development and implementation of security policies and oversight of physical security measures

  Drafting and maintaining relevant security documentation.

  Management and oversight of the COMSEC program, including inventory and incident response.

  Collaboration and coordination with Cyber Security Service Providers (CSSP).

  You’ll Bring These Qualifications

  U.S. Citizenship with an active DOD Government SECRET security clearance.

  Degree in Information Assurance, Computer Science, or a related field, or equivalent experience.

  Security+ Certification or equivalent DOD 8570 IAT Level 2 certification; CISSP is a plus.

  Knowledge of National/DoD/Army security policies.

  Risk management expertise.

  Proficiency in security provisioning and monitoring tools.

  Strong communication and teamwork skills.

  Understanding of DOD Cybersecurity policies and requirements.

  10+ years of related technical experience.

  Experience with COMSEC, CCRI, and coordination with CSSP.

  Hardening devices using Security Technical Implementation Guides (STIGs)

  Experience with building/configuring ACAS/Tenable Nessus, Firewalls, Intrusion Prevention Systems, and enterprise Antivirus technologies.

  Familiarity with continuous integration tools.

  Hands on experience with Security Architecture and Design

  Ability to recommend Best in Breed toolsets to cover Defense-in-Depth principles.

  These Qualifications Would Be Nice to Have

  Knowledge of ISO 27000 information security management principles.

  Proficiency in scripting languages and CND processes.

  Ability to creatively solve problems and work independently.

  Specific technologies may vary, but understanding the deployment ofconfiguration of the following technologies is a plus: Palo Alto Firewall, Trellix AESS Suite, Tenable Nessus ACAS, VMWare, Ribbon Communication for VOIP.

  What We Can Offer You:

  We’ve been named a Best Place to Work by the Washington Post.

  Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives.

  We offer competitive benefits and learning and development opportunities.

  We are mission-oriented and ever vigilant in aligning our solutions with the nation’s highest priorities.

  For over 60 years, the principles of CACI’s unique, character-based culture have been the driving force behind our success.

  Company Overview: At CACI, you will have the opportunity to make an immediate impact by providing information solutions and services in support of national security missions and government transformation for Intelligence, Defense, and Federal Civilian customers. CACI is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other protected characteristic.

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