Network Security Engineer Senior

General Dynamics Information Technology, Inc.; Ashburn (VA); On-site; USD 124,000 - 167,000; Full time

Job summary

General Dynamics Information Technology, Inc. seeks a Network Security Engineer Senior to support CBP Cyber Security Directorate in protecting federal networks.

You will lead design, engineering, and lifecycle management of enterprise security infrastructure including firewalls, IDS/IPS, VPNs, and NAC. You will analyze architectures, develop mitigations, monitor events, guide investigations, and enforce policies to meet NIST/CIS standards.

Qualifications

• Seven+ years of hands-on network or security engineering experience.
• Experience with enterprise-grade firewalls, IDS/IPS, VPNs, and NAC.
• Familiarity with regulatory frameworks (NIST, CIS, ISO 27001).
• U.S. citizenship required.

Responsibilities

• Lead the design 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.
• Monitor and interpret complex network security events, guide investigations of advanced threats, and direct response and containment activities as needed.
• Develop, review, and enforce network security policies, standards, and procedures to meet compliance obligations.
• Mentor junior and mid-level engineers to promote professional growth and engineering excellence.

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

Type of Requisition: Regular Clearance Level Must Currently Possess: None Clearance Level Must Be Able to Obtain: None Public Trust/Other Required: BI Full 6C (T4) Job Family: Cyber and IT Risk Management Job Qualifications: Skills: Cybersecurity, Cybersecurity Operations, IT Network Security, Network Security Tools Certifications: None Experience: 8 + years of related experience US Citizenship Required: Yes

Job Description: The U.S. Customs and Border Protection (CBP) Cyber Security Directorate (CSD) is leading one of the most comprehensive, mission critical cybersecurity operations in the federal government, protecting the digital infrastructure that safeguards America’s borders. This multifaceted program spans 24/7/365 Security Operations Center (SOC) monitoring, advanced threat intelligence, forensics, incident response, cloud and network security engineering, zero trust modernization, vulnerability assessment, and enterprise-wide risk and compliance activities. The Network Security Engineer Senior will support teams at the forefront of national security, supporting sophisticated cyber operations that defend vital systems, enable secure mission execution, and counter rapidly evolving threats. You will find this work uniquely impactful, fast-paced, and deeply collaborative, offering the opportunity to lead high performing technical teams, shape CBP’s cybersecurity strategy, and contribute directly to the protection of the nation.

MEANINGFUL WORK AND PERSONAL IMPACT The Network Security Engineer Senior plays a critical role in supporting the implementation, monitoring, and maintenance of security technologies across enterprise networks. This role helps strengthen the organization’s cybersecurity posture by ensuring network devices, configurations, and traffic flows align with modern security standards and federal requirements.

Working within a fast‑paced cybersecurity mission environment, the engineer contributes to safeguarding critical systems that underpin national‑level operations. As a Network Security Engineer Senior, you will:

• Lead the design, engineering, and lifecycle management of enterprise network security infrastructure including firewalls, intrusion detection and prevention systems (IDS/IPS), VPN solutions, and network access control 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 continuous 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, system upgrades, and enterprise architecture decisions.
• Provide mentorship, technical guidance, and quality oversight to junior and mid‑level engineers to promote professional growth and ensure consistent 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.

WHAT YOU’LL NEED TO SUCCEED 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, intrusion detection and prevention systems, VPNs, and network access controls. 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. Expertise developing network security policies, procedures, and standards while ensuring compliance with security frameworks and regulatory requirements. Experience monitoring and responding to security incidents. Familiarity with regulatory and compliance frameworks (e.g., NIST, ISO 27001, CIS)..

Preferred certifications may include: CISSP CCSP CCNP Security CompTIA Security+ CCNA or CCNA Security

EDUCATION AND EXPERIENCE Bachelor’s degree preferred in cybersecurity, information technology, computer science, or a related field. Minimum of seven (7) years of hands‑on network or security engineering experience. Previous or Current CBP Background Investigation desired.

OWN YOUR OPPORTUNITY Explore a career in cyber security at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your passion for securing the mission. The likely salary range for this position is $124,093 - $167,325. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range. Scheduled Weekly Hours: 40 Travel Required: Less than 10% Telecommuting Options: Onsite Work Location: USA VA Ashburn Additional Work Locations: Total Rewards at GDIT: Our benefits package for all US‑based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post‑tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long‑term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process: As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work: We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission‑ready capabilities in AI, cloud, cyber and software development.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans Opportunity Owned From working with technologies like AI, cyber and cloud to careers in intelligence and health, we offer endless opportunities to apply your expertise to create a safer, smarter world.