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# Senior Firewall Engineer

- **Company:** D2 Consulting
- **Location:** Springfield, VA, United States
- **Experience:** Expert
- **Salary:** $130,000.0 - $140,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Unix, Cyber Security, Intrusion Detection Systems, Network Security, Red Hat Enterprise Linux, Network Routers, Load Balancing, Firewalls (Computer Science), Juniper, Build Management, Palo Alto Networks, Fireeye, Cisco, Vmware
- **Published:** August 24, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9113880/senior-firewall-engineer

## About the Role

* Active TS/SCI clearance (must be current)
 * Ability to pass a U.S. Government Polygraph (post-hire)
 * DoD 8140.01 / 8570.01-M IAT Level II compliant certification (current)
 * CSSP Infrastructure Support certification - or the drive to earn it within 120 days of starting

Experience:

 * 5+ years in Network Security within large-scale enterprise or global environments
 * BA/BS degree preferred - but strong hands-on experience can speak just as loudly. You can substitute a degree with 4 years of additional experience
 * Firewalls: Palo Alto, Juniper, Cisco
 * Routers/Switches: Juniper, Cisco
 * IDS/Threat Tools: FireEye, F5 Load Balancer, Cisco FTD
 * OS/Platforms: Unix, RHEL, Windows Enterprise AD, VMware

## Description

D2 Consulting is looking for a skilled Senior Firewall Engineer to join a high-impact team protecting mission-critical infrastructure. You'll work side-by-side with both corporate and government leadership - meaning your work gets noticed, and your voice matters.

What You'll Actually Be Doing

This isn't a "maintain the status quo" role. You'll be solving real security challenges at enterprise scale:

 * Design & build state-of-the-art secure network architectures - from concept to implementation
 * Protect the network by managing WAN, LAN, CAN, and remote security environments, handling incidents with speed and precision
 * Own the security stack - firewalls, F5 load balancers, web/mail gateways, IDS platforms, and management tools
 * Lead incident response - investigate, document, and drive corrective action when it matters most
 * Shape security operations by developing SOPs that the broader team will rely on
 * Stay ahead of threats by researching and evaluating emerging network security technologies
 * Be the expert in the room - serve as a trusted liaison to contract leadership, customers, and government DAA stakeholders on security posture, policies, and procedures


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