Senior Network Engineer

Type of Requisition

Regular

Top Secret SCI + Polygraph

Top Secret SCI + Polygraph

None

IT Infrastructure and Operations

Skills: Cisco IOS, Internet Protocol Security (IPsec), Linux, Network Monitoring Tools, Routing and Switching

Certifications: None

Experience: 8 + years of related experience

US Citizenship

Required:

Yes

Own your opportunity to work with the largest government agency in the nation. Make an impact by advancing the mission to keep our country safe and secure.

• Experience with Cisco IOS, Cisco Routers and Switches, Internet Protocol Security (IPsec), Switching Protocols, Virtual Private Networks (VPNs)

• Design, plan, build, and maintain secure communications networks supporting enterprise and hybrid environments.
• Configure routers, switches, firewalls, and IPSec-based VPN solutions for LAN, WAN, and remote-access connectivity.
• Coordinate LAN/WAN hardware/software improvements and/or enhancements.
• Ensure network reliability, scalability, and compliance while leveraging automation and emerging technologies to enhance operational efficiency and support mission‑critical business operations.
• Provide current network diagrams and other documentation.
• Display a comprehensive understanding of routing and switching protocols (OSPF, BGP, EIGRP, VLAN, Spanning Tree, Multicast).
• In‑depth understanding of Cisco IOS platforms and practical knowledge of networking topologies (LAN, WAN) and hands‑on experience with IPSec VPNs.
• Experience with network diagnostic, monitoring, and analysis tools (e.g., Solar Winds, Splunk).
• Design, implement, and maintain complex LAN/WAN infrastructures, including routing, switching, and secure VPN connectivity.
• Ensure network integrity, compliance with security policies, and proper backup and recovery processes.
• Install, configure, manage, and troubleshoot F5 BIG‑IP systems to ensure applications are fast, available, and secure.
• Analyze, diagnose, and resolve complex performance and connectivity issues.
• Proven experience with Cisco Secure Firewalls (FTD/FMC), ISE, and 802.1x authentication, including device access troubleshooting on network switches.
• Evaluate and integrate new communications technologies to enhance network performance, security, and scalability.
• Create network diagrams using Microsoft Visio.
• Document network design and create Standard Operating Procedures for the installation and configuration of network devices.
• Maintain current knowledge of evolving network and automation technologies.
• Collaborate effectively with cross‑functional teams and provide mentorship when needed.
• Linux system administration (Red Hat Enterprise) preferred.
• Configure and administer Cisco routers, switches, secure firewalls, and ISE for identity‑based access control and 802.1x authentication.

• Must possess and maintain a TS/SCI clearance with lifestyle polygraph.
• Education:
  
  BA/BS degree or equivalent work experience.
• Experience:
  
  8+ years of related experience.
• Certifications:
  
  DoD 8570.01, Cisco CCNP (active) required.
• Additional
  
  Certifications:
  
  Cisco CCNP Enterprise, CCNP Security, Dev Net, F5 certification.
• US citizenship.

• Knowledge of Cisco Catalyst and Cisco Nexus series switches.
• Knowledge of F5 BIG‑IP.
• Knowledge of Cisco ISR Gen2 (1900, 2900, 3900 series) and ISR Gen3 (4000 series) routers.
• Knowledge of Cisco Firepower series firewalls.
• Knowledge (including installation) of NSA Cryptographic devices (KG-175, KG-250).
• Knowledge of configuration of Cisco IOS 15.x, Cisco IOS‑XE 16.x, and NX‑OS 9.x.

• On Customer Site

• US Citizenship Required

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

• Growth: AI‑powered career tool that identifies career steps and learning opportunities
• Support:
  An internal mobility team focused on helping you achieve your career goals
• Rewards:
  Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
• Flexibility:
  Full‑flex work…