Network Engineer - TS/SCI w/ Poly

Company: GD Information Technology
Location: Mc Lean
Posted on: April 2, 2026

Job Description:

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: Cisco ASA Firewall, Local Area Network (LAN), Networks, Technical Support Certifications: None Experience: 15 years of related experience US Citizenship Required: Yes Job Description: The Network Engineer (SME) is responsible for designing technical solutions for complex problems. The candidate will provide technical oversight of a project solution, including requirement interpretation and allocation of requirements to technical components. The candidate will define processes to support the implementation of requirements. The candidate will be responsible for ensuring that the technical solutions leverage industry best practices, designing security and excellence while minimizing the total cost of ownership. Candidate should be able to define internal and external customer IT infrastructure architecture needs and then design solutions to meet those needs to include: capacity planning, systems configuration and tuning, monitoring backups, and installations of hardware and software. Candidates will be required to work independently with little supervision and should be flexible to work and support IT Operations needs as requested. HOW A NETWORK ENGINEER WILL MAKE AN IMPACT Define, maintain, and upgrade the overall security posture of the networks Will perform security audits of events, overall health and implement changes to improve the overall programs security posture. Manage and allocate network installation and engineering tasks, configure and maintain communications systems, familiarity with implementation of LAN and WAN equipment including firewalls, servers, workstations, routers, switches, hubs, storage devices, A/V equipment and equipment racks Ability to write and edit “build-to” and “as-built” documentation, as well as implementation and test plans for physical and logical installs of IT equipment Able to engage in technical system planning beyond the network, to include applications and systems that utilize the network being delivered Provides expert level analysis of voice, video, and/or data communications networks, including planning, designing, evaluating, selecting, and upgrading operating systems and protocol suites Able to plan network layouts and configures systems to user environments May provide technical support and troubleshooting to users. (Tier I, II, and III) May serve as a technical team and/or task leader, must be independent and self-motivated WHAT YOU’LL NEED TO SUCCEED: Required Qualifications: Experience allowing voice, video traffic across port-based firewall and NGFW Expertise/experience (more than 10) deploying Cisco, Palo Alto, or Juniper firewall Manager servers Experience in engineering and deploying multi firewall solutions Experience design, engineering, and deploying controlled interfaces (10 years) Experience design, engineering, and deploying firewall vendor transitioning plans Experience design, engineering, and deploying firewall in a multicast network environment Experience IPSec site-to-site VPN utilizing PKI (CA) Experiences Remote access VPN 12 years of experience configuring/maintaining Cisco ASA/Next Generation Firewall 10 years of experience configuring, designing, maintaining, and troubleshooting LAN/WAN devices. Thorough understanding of network routing concepts (EIGRP, OSPF, BGP, IP MPLS) Basic understanding of QoS concepts Experience with network monitoring technologies Ability to take ambiguous requirements or problems and convert them into technical solutions Ability to partner with systems administrators, storage administrators, and application developers to solve complex problems Complex problem management research and issue resolution Ability to mentor junior network engineers Desired Qualifications: Experience configuring, designing, and troubleshooting QoS in LAN or WAN devices Juniper, Palo Alto, or Cisco Next Generation Firewalls Certifications and hands on experience Experience design, engineering, and deploying Muli-Factor Authentication solution Experience design, engineering, and deploying Zero-Trust solutions WHAT YOU’LL NEED TO SUCCEED: 15 years of related Network Engineering experience Bachelor’s or Technology degree in Engineering or a related specialized area/field, OR equivalent 19 years job-related experience TS/SCI with Poly clearance Excellent organizational, coordination, interpersonal and team building skills Proven problem-solving skills in complex environments Location: At Customer Site – near Tyson Corner 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 GDITCareers cjpost GDITPolyEvent JET VA_2026Alumni GDITEnhanced2025 The likely salary range for this position is $182,750 - $247,250. 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: None T elecommuting Options: Onsite Work Location: USA VA McLean 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 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 at gdit.com/tc . Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Keywords: GD Information Technology, Arlington , Network Engineer - TS/SCI w/ Poly, IT / Software / Systems , Mc Lean, Virginia