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Senior Network Engineer - TS/SCI with Polygraph
Company: General Dynamics IT
Location: Springfield, VA
Employment Type: Full Time
Date Posted: 04/02/2026
Job Categories: Engineering, Information Technology
Job Description
Senior Network Engineer - TS/SCI with Polygraph

Location: Springfield, VA (Customer Site)
Travel: Approximately 25%
Clearance: Active TS/SCI with ability to obtain a Polygraph
Citizenship: US Citizenship Required

GDIT has an exciting and challenging opportunity for a Network Engineer supporting an Intelligence Community customers wide-area (WAN), local-area (LAN), and campus-area (CAN) networks across multiple security domains. In this role, you will support new engineering initiatives, lead efforts around network modernization, and ensure the sustained operation of missioncritical infrastructure.

Responsibilities:

  • Coordinate system maintenance, monitoring, and installation activities across diverse WAN/LAN environments and technologies.

  • Research, recommend, and implement enterprise network capabilities and enhancements aligned with mission and business objectives.

  • Troubleshoot and resolve issues with network media, components, and connectivity.

  • Evaluate and monitor network health, performance, and hardware/software effectiveness.

  • Develop and maintain technical roadmaps for network capabilities, operations, and technologies.

  • Create and execute detailed test plans and documentation for all network configuration changes, upgrades, and additions.

  • Support network traffic analysis and bandwidth optimization to meet performance and availability targets.

  • Assess and provide recommendations on emerging network and communication technologies.

  • Recommend upgrades and changes aligned with industry standards and best practices.

  • Adhere to all customer network security policies, procedures, and compliance requirements.

  • Represent customer requirements and priorities during technical exchanges with partner agencies.

  • Conduct site surveys for new installations and technology refresh initiatives.

  • Install, maintain, and troubleshoot satellite communications equipment.

  • Create and maintain network architecture diagrams.

Required Qualifications:

  • Active TS/SCI clearance with ability to obtain a Polygraph

  • BS degree or equivalent experience

  • 8+ years of hands-on experience with network and transport technologies, tools, and techniques

  • 4+ years supporting large-scale enterprise or global networks in a fastpaced, diverse environment

  • Active 8570/8140 Approved IAT II certification required

  • Working knowledge of DoD Architecture Framework and related DoW network architecture guidance

  • Experience with Juniper network devices (MX, EX, SRX) and cryptographic devices (KG175G/X, KG245A/X)

  • Proficiency with network analysis tools (HP/Microfocus NA/NNM, Juniper Secure Analytics, Infoblox, Riverbed)

  • Experience with Juniper firewall/VPN technologies (SRX series)

  • Experience supporting IP services for NIPRNET, SIPRNET, and JWICS (IPv4/IPv6, VPN, Multicast, QoS, SDN, SNMP, VOIP, VTC, etc.)

  • Strong understanding of OSPF, BGP, MPLS, RSVP/LDP Layer 2/3 VPNs, VRFs, IKE/IPSec, GRE tunnels, MTU, FTP, and routing policy frameworks

Desired Qualifications:

  • Masters degree in Computer Science or related field

  • Professional certifications such as JNCIA, JNCIS, JNCIP, CCNP, CCVP, CCNA, or CCDP

  • ITIL v3 Foundations

  • ISC2 CISSP

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