Senior Network Engineer - TS​/SCI 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 customer’s 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 mission‑critical infrastructure.

• 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.

• 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 fast‑paced, 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 (KG‑175G/X, KG‑245A/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

• Master’s degree in Computer Science or related field

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

• ITIL v3 Foundations

• ISC2 CISSP