Senior Network Security Engineer: Lead Network Defense

General Dynamics IT; Ashburn (VA); On-site; USD 140,000 - 190,000; Full time

Job summary

General Dynamics IT is seeking a Senior Network Security Engineer to support CBP Cyber Security Directorate. The role focuses on designing, deploying, and maintaining secure enterprise network infrastructure, including firewalls, IDS/IPS, VPNs, and NAC, while ensuring compliance with federal standards.

You will lead security engineering efforts, mentor junior engineers, and work in a fast‑paced, mission‑critical environment to safeguard national security networks.

Qualifications

• Minimum of seven (7) years of hands‑on network or security engineering experience.
• Experience with enterprise‑grade firewalls, IDS/IPS, VPNs, and NAC tools.
• Detailed understanding of network protocols, architecture, and security best practices.
• Expertise maintaining network security infrastructure including firewalls, IDS/IPS, VPNs, and NAC.
• Proficiency providing expert analysis of network security architectures and developing solutions to protect network assets from threats and vulnerabilities.
• Experience monitoring network security events, investigating security incidents, and implementing security enhancements to strengthen network defenses.
• Familiarity with regulatory and compliance frameworks (e.g., NIST, ISO 27001, CIS).

Responsibilities

• Lead the design, engineering, and lifecycle management of enterprise network security infrastructure including firewalls, IDS/IPS, VPN solutions, and NAC technologies.
• Provide expert analysis of network security architectures, identify vulnerabilities, and develop mitigation strategies that align with federal and organizational security requirements.
• Monitor and interpret complex network security events, guide investigations of advanced threats, and direct response and containment activities as needed.
• Recommend and implement security enhancements to improve resilience, reduce attack surface, and support modernization of the network security environment.
• Develop, review, and enforce network security policies, standards, and procedures to meet compliance obligations under frameworks such as NIST, CIS, and other regulatory requirements.
• Serve as a technical advisor to leadership and cross‑functional teams, ensuring secure design principles are embedded into program initiatives and enterprise architecture decisions.
• Provide mentorship, technical guidance, and quality oversight to junior and mid‑level engineers to promote professional growth and engineering excellence.
• Develop, document, and maintain network security policies, procedures, and standards.
• Ensure compliance with applicable security frameworks, regulatory requirements, and organizational policies.
• Collaborate with IT, security operations, and infrastructure teams to support secure network design and operations.

Skills

Cybersecurity

Cybersecurity Operations

IT Network Security

Network Security Tools

Education

Bachelor's degree in cybersecurity, information technology, computer science, or a related field

Job description

General Dynamics IT is seeking a Senior Network Security Engineer to support CBP Cyber Security Directorate. The role focuses on designing, deploying, and maintaining secure enterprise network infrastructure, including firewalls, IDS/IPS, VPNs, and NAC, while ensuring compliance with federal standards.

You will lead security engineering efforts, mentor junior engineers, and work in a fast‑paced, mission‑critical environment to safeguard national security networks.