Network Engineer - TS/SCI w/Poly

Own your opportunity to serve as a critical component of our nation's safety and security. Make an impact by using your expertise to protect our country from threats., Network Engineer Senior Join a team where your expertise directly protects critical missions and makes a national impact. As a Network Engineer Senior, you'll design, support, and optimize an enterprise-scale network that keeps thousands of users and systems connected, secure, and mission-ready every day.

How You'll Make an Impact In this role, you will:

• Provide day-to-day operational support, troubleshooting, and maintenance for a large-scale Juniper and Cisco switching infrastructure.
• Configure and maintain load balancers and boundary security devices (e.g., firewalls, edge routers) to ensure resilient and secure connectivity.
• Use Forward Networks to:

• Build virtual replicas ("digital twins") of the production network
• Simulate and validate SDN code changes before they go live
• Document and visualize the physical and logical network topology

• Safeguard network integrity, performance, and security across a distributed environment supporting several hundred thousand endpoints.
• Monitor and respond to network events and incidents, leading root cause analysis and driving permanent fixes.
• Maintain accurate network diagrams, configurations, and documentation in line with industry and organizational standards.
• Ensure alignment with security policies, regulatory requirements, and best practices.
• Participate in planning and executing network upgrades, migrations, and performance optimizations.
• Collaborate closely with cybersecurity, infrastructure, and application teams to deliver end-to-end solutions.
• Operate with a high degree of autonomy, proactively identifying, diagnosing, and resolving complex network issues.

Bring your engineering expertise and passion for innovation to GDIT. In this senior role, you will leverage your experience to shape and support a mission-critical network environment.Basic Qualifications

• Education: Bachelor's degree (BA/BS)
• Experience: 5+ years of hands-on experience supporting enterprise networks using Cisco and Juniper technologies

Technical Skills

• Strong knowledge of Layer 2/3 networking and core routing technologies, including:

• OSPF, BGP, EIGRP
• VLANs, VRFs, QoS

• Experience configuring and managing load balancers (F5, Citrix, or equivalent)
• Experience with boundary security devices, such as firewalls or network access control appliances
• Proficiency with Forward Networks or similar digital twin/virtual network simulation tools

Role Requirements

• Solid understanding of Software-Defined Networking (SDN) concepts and architectures
• Proven ability to work independently and manage priorities in a complex, dynamic environment
• Strong awareness of network security best practices, compliance standards, and patch management processes
• Excellent written and verbal communication skills, with the ability to clearly explain technical concepts to both technical and non-technical stakeholders
• Willingness to participate in an on-call rotation to support a 24/7 mission environment

Preferred Qualifications

• Professional network certifications such as CCNP, JNCIP, CCIE, or JNCIE
• Experience supporting high-availability, mission-critical environments
• Familiarity with scripting and automation tools (e.g., Python, Ansible)
• Background in government or other highly regulated enterprise environments

Clearance & Certification Requirements

• Security Clearance: TS/SCI with Polygraph
• Citizenship: U.S. citizenship required
• Certification: 8570-compliant with Security+ (or the ability to obtain if not already held)

#MD_2026Alumni

#GlobalServices

Work Requirements

Years of Experience

5 + years of related experience

• may vary based on technical training, certification(s), or degree

Certification

CompTIA Security+ CE | CompTIA - CompTIA Travel Required

Less than 10% Citizenship

(part of General Dynamics) 3.73.7 out of 5 stars Annapolis Junction, MD $110,500 - $149,500 a year, The likely salary range for this position is $110,500 - $149,500. 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.

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. Join our Talent Community to stay up to date on our career opportunities and events at gdit.com/tc.