Network Engineer - TS/SCI w/Poly

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret SCI Polygraph Clearance Level Must Be Able to Obtain: Top Secret SCI Polygraph Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Job Qualifications: Skills: Enterprise Network, Network Engineering, Network Infrastructures Certifications: None Experience: 5 years of related experience US Citizenship Required: Yes Job Description: 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. What You’ll Need to Succeed 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 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. Scheduled Weekly Hours: 40 Travel Required: Less than 10% Telecommuting Options: Onsite Work Location: USA MD Annapolis Junction 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. We are GDIT. A global technology and professional services company that delivers consulting, technology 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 capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology. Join our Talent Community to stay up to date on our career opportunities and events at gdit.com/tc. Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans Join our 26,000 everyday heroes. We are GDIT. A global technology and professional services company that delivers consulting, technology 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 30 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology. 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Salary : $110,500 - $149,500