Senior Network Engineer - TS​/SCI Polygraph

Job Qualifications

Cisco, CISSP, Local Area Network (LAN), Transport Technologies, WAN Networking

Type of Requisition:
Regular

Top Secret/SCI

Top Secret SCI + Polygraph

None

IT Infrastructure and Operations

Job Qualifications:

Cisco, CISSP, Local Area Network (LAN), Transport Technologies, WAN Networking

None

8 + years of related experience

Yes

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

The likely salary range for this position is $123,250 - $166,750. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience,…