Type of Requisition:PipelineClearance Level Must Currently Possess:Top Secret SCI + PolygraphClearance Level Must Be Able to Obtain:Top Secret SCI + PolygraphPublic Trust/Other Required:NoneJob Family:Network EngineeringJob Qualifications:Skills:Data Communication Networks, Network Communications, NetworksCertifications:NoneExperience:5 + years of related experienceUS Citizenship Required:YesJob Description:Transform technology into opportunity as a Sr. Network Engineer with GDIT. A career in enterprise IT means connecting and enhancing the systems that matter most. At GDIT you’ll be at the forefront of innovation and play a meaningful part in improving how agencies operate.At GDIT, people are our differentiator. As a Sr. Network Engineer you will help ensure today is safe and tomorrow is smarter. Our work depends on Network Engineer Senior joining our team to support our client’s mission.GDIT is seeking an experienced and mission-driven Network Engineer to support the design, implementation, and sustainment of Cross-Domain Solutions (CDS) in a secure, multi-domain environment for a high-impact program within the U.S. government.Key Responsibilities:Design and manage secure, policy-enforced networks supporting CDS architectures across multiple security domains (e.g., TS/SCI, Secret, Unclassified).Collaborate with security engineers, CDS developers, and mission stakeholders to architect solutions that meet mission and policy requirements.Deploy, configure, and maintain network devices (routers, switches, firewalls, TAPs) and virtual networking within air-gapped and compartmented environments.Support the integration of NSA-approved CDS technologies into enterprise and tactical environments.Troubleshoot and resolve complex network and cross-domain data flow issues in a secure, mission-critical setting.Ensure all networking components are configured per ICD 503, CNSS policies, and relevant Cross Domain Risk Management (CDRM) guidelines.Participate in system hardening, vulnerability assessments, and Authority to Operate (ATO) efforts in partnership with ISSOs and Information Systems Security Engineers (ISSEs).Maintain system documentation, including CONOPS, security plans, interface control documents (ICDs), and network diagrams for accreditation and operational use.Support lab testing, operational evaluations, and live deployments across IC or partner agency environments.Required Experience:Active TS/SCI with CI (polygraph required at start or willingness to sit).Bachelor’s degree in Network Engineering, Information Systems, or related technical field, or equivalent experience (or equivalent experience).8+ years of experience supporting secure network infrastructure within the Intelligence Community or DoD.Strong knowledge of Layer 2/3 networking, VLANs, routing protocols (BGP, OSPF), NAT, ACLs, and network segmentation.Proficient with Cisco, Juniper, Palo Alto, or similar platforms.Direct experience supporting or integrating one or more NSA-evaluated CDS solutions.Familiarity with ICD 503, NIST 800-53, CNSSI 1253, and related A&A processes.Experience working in air-gapped, high-side/low-side data transfer environments.Preferred Skills:Experience with specific CDS platformsUnderstanding of Zero Trust principles and segmentation in classified environments.Familiarity with DevSecOps, software-defined networking (SDN), or IC cloud environments (C2S, SC2S).Industry certifications such as CCNA/CCNP, Security+, CISSP, or CEH.Experience supporting lab environments and integration test events.Knowledge of virtualization platforms (VMware, KVM) and secure system administration.Knowledge of SAFE Agile principles.GDIT IS YOUR PLACE:? 401K with company match? Comprehensive health and wellness packages? Internal mobility team dedicated to helping you own your career? Professional growth opportunities including paid education and certifications? Cutting-edge technology you can learn from? Rest and recharge with paid vacation and holidays.The likely salary range for this position is $103,700 - $140,300. 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:40Travel Required:10-25%Telecommuting Options:OnsiteWork Location:USA VA HerndonAdditional 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 30,000 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 atgdit.com/tc.Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans