Network Engineer - TS​/SCI

GDIT is seeking a Network Engineer to support Enterprise Transport Management (ETM) operations at the Pentagon. This is a full‑time onsite role requiring active TS/SCI clearance. The Network Engineer reviews, designs, and supports IT infrastructure to ensure high availability, security, and performance of mission‑critical DoD networks. This role involves network design, configuration, optimization, troubleshooting, and lifecycle management across diverse vendor technologies.

• Design, plan, configure, and implement LAN/WAN networks, routing, switching, and firewalls.
• Deploy and maintain routers, switches, VPN concentrators, remote access systems, and network servers.
• Serve as a senior escalation point (Tier 3+ ) for complex transport, optical, crypto, and routing/switching issues.
• Monitor network health, performance, and capacity; perform proactive maintenance and upgrades.
• Maintain network integrity, documentation, SOPs, topologies, and backup/recovery capabilities.
• Evaluate and integrate new communications technologies.
• Lead or mentor less‑experienced network personnel.
• Utilize ITSM ticketing systems for workflow management and detailed technical documentation.
• Support DoD‑specific network environments and comply with security baselines and policies.
• Perform lifecycle management including patching, firmware, and hardware refreshes.

• Active Top Secret/SCI security clearance.
• IAT Level II certification.
• Networking certifications:
  Brocade, Cisco (CCNA/CCNP), Juniper (JNCIA/JNCIS/JNCIP).
• 5+ years of experience in network administration.
• Bachelor's Degree in a related field, or work experience in lieu of a degree.
• Hands‑on experience with Aruba networking systems.
• Strong knowledge of routing protocols and L3 configurations.
• Willing to report full‑time onsite at the Pentagon in Arlington, VA.

• 10+ years overall experience, including:
• 5+ years leading installs, troubleshooting, and operations of network devices.
• 5+ years designing and architecting routed/switch networks.
• 3+ years in DoD environments.
• Expertise with routing (BGP, OSPF, EIGRP), switching (VLANs, STP, VxLAN), and multi‑tenant and virtualized network architectures.
• Experience with scripting (Perl, Python) for automation and event handling.
• DoD 8570/8140 IAT Level III certification.
• Bachelor’s in Information Systems, Engineering, or a related field (Master’s preferred).