Network Engineer - TS/SCI w/Polygraph

General Dynamics IT; United States; On-site; USD 102,000 - 138,000; Full time

Benefits offered by this job

401K with company match

Health and wellness packages

Internal mobility and career growth

Professional education and certs

Job summary

General Dynamics IT is seeking a Network Engineer to provide technical oversight of IT infrastructure projects at a customer site in the Herndon area.

You will define architecture needs, design solutions, and support capacity planning, system configuration, backups, and hardware/software installations.

Qualifications

• Bachelor's degree or 9 years related experience required.
• 5+ years of network engineering experience.
• Experience configuring Cisco ASA/Next Generation Firewall and LAN/WAN devices.

Responsibilities

• Define, maintain, and upgrade network security posture.
• Perform security audits and implement improvements.
• Configure LAN/WAN devices and firewalls (Cisco ASA/NGFW).
• Develop build-to and as-built IT installation docs.
• Provide Tier I–III technical support as needed.

Skills

Cisco ASA Firewall

LAN

Networks

Technical Support

Education

Bachelor's degree in Engineering or related field OR 9 years experience

Tools

Cisco ASA/NGFW

LAN/WAN devices

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: 5 + years of related experience
• US Citizenship Required: Yes

Job Description

At GDIT, people are our differentiator. As a Network Engineer, you will help ensure today is safe and tomorrow is smarter.

Our work depends on the Network Engineer joining our team will provide technical oversight of a project solution, including requirement interpretation and allocation of requirements to technical components. 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)

What You'll Need to Succeed

• The position requires an active TS/SCI with Polygraph clearance
• Bachelor's or Technology degree in Engineering or a related specialized area/field, OR equivalent 9 years job-related experience
• 5+ years of related Network Engineering experience
• 3+ years of experience configuring/maintaining Cisco ASA/Next Generation Firewall
• 4 + years of experience configuring, designing, maintaining, and troubleshooting LAN/WAN devices. Thorough understanding of network routing concepts (EIGRP, OSPF, BGP, IP MPLS)
• Experience allowing voice, video traffic across port-based firewall and NGFW
• Experience deploying Cisco, Palo Alto, or Juniper firewall Manager servers
• Experience in engineering and deploying multi firewall solutions
• Experience design, engineering, and deploying controlled interfaces (5 + 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
• 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
• Excellent organizational, coordination, interpersonal and team building skills
• Proven problem-solving skills in complex environments

Location: At Customer Site - Herndon Area

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

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

#GDITPolyEvent

#GDITEnhanced2026

#MissionPoly2026

#VA_2026Alumni

#CJPost

#Jet

The likely salary range for this position is $102,000 - $138,000. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geogr