Senior Network Engineer

Agile Defense

Senior Network Engineer engineering DHS enterprise networks for Agile Defense’s national-security missions. Configuring SD-WAN, firewalls, cloud interconnects, and critical infrastructure.

Posted 8/19/2026full-timeAshburn • Virginia • 🇺🇸 United StatesSenior💰 $120,000 - $140,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive expertise in network engineering, including configuration and troubleshooting of WAN, LAN, SD-WAN, and VPN technologies. Proficient in managing complex network infrastructures and providing Tier 2/Tier 3 support while ensuring compliance with federal standards.

Highest-signal resume keywords

Network Engineering ExperienceSD-WAN ImplementationCisco Technology ExpertiseTCP/IP and Routing Protocols KnowledgeActive CBP BI Public Trust Eligibility

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Network ConfigurationTroubleshootingSD-WAN VirtualizationFirewall ManagementTCP/IPBGPOSPFEIGRPMPLSVLAN

Soft Skills

Problem-SolvingAnalytical Skills

Tools & Technologies

Cisco ACIVMware NSXZscalerPalo AltoServiceNowRemedy

Certifications & Qualifications

CCNACCNP

Industry Keywords

Department of Homeland SecurityFederal AgencyZero TrustInfrastructure ModernizationEmergency Change Requests

Tech Stack

Tools & technologies

CloudFirewallsServiceNowSwitchingTCP/IPVMware

About the role

Key responsibilities & impact

Serve as a Senior Network Engineer enabling the Department of Homeland Security mission and enterprise network infrastructure
Engineer, maintain, configure, and troubleshoot WAN, LAN, SD-WAN, VPN, WLAN, and perimeter security controls according to customer standards and mandates
Configure, deploy, and support enterprise-grade switches, routers, firewalls, VPN gateways, logging baselines, and load balancers across DHS operational environments
Provide Tier 2/Tier 3 escalation support for network outages, circuit degradations, and performance issues
Conduct root cause analyses and coordinate vendor support
Support planning, installation, and cutover of network hardware upgrades, SD-WAN transitions, cloud interconnects, remote field sites, and infrastructure modernization
Design, implement, and maintain SD-WAN across multiple network transports and remote sites
Use SD-WAN virtualization to route traffic based on application type, routing policies, and network performance requirements
Maintain network diagrams in Visio, topology maps, inventory databases, SOPs, and ServiceNow/Remedy change-control tickets
Respond to Tier 3 critical network incidents within SLA limits and coordinate cross-functional escalations
Implement Emergency Change Requests, Emergency Break Fixes, or Change Requests when needed to restore services
Participate in RCA and post-incident analysis for mission-critical applications and enterprise IT infrastructure
Partner with program and project managers on deliverables, milestones, and resource planning

Requirements

What you’ll need

Bachelor’s degree in management information systems, Computer Science, Engineering, or a related technical field with 10+ years of network engineering experience, or 14+ years of network engineering experience without a bachelor’s degree
Minimum of ten (10) years of verifiable network engineering experience supporting a large, complex Federal agency
Strong knowledge of TCP/IP, BGP, OSPF, EIGRP, MPLS, VPNs, and VLANs
Expertise and experience with Cisco technology and firewall technologies
Ability to perform firewall changes
Hands-on experience with SDN technologies such as Cisco ACI or VMware NSX
Excellent problem-solving and analytical skills; ability to troubleshoot complex network issues
Ability to travel within the United States, on short notice or scheduled, up to 35% of the time
Eligibility to receive a CBP BI public trust
Active CBP BI or within the past 3 years (preferred)
Active industry certifications such as CCNA or CCNP (routing and switching) (preferred)
Experience with Zero Trust (Zscaler) and Palo Alto technologies (nice to have)
Previous CBP experience highly desired, followed by DHS or DoW experience
Advanced skills in at least 3 of Cisco SD-WAN, Cisco Hyperflex, Cisco StealthWatch, Cisco Application Centric Infrastructure, and Cisco Firepower (preferred)
Willingness to be cross-trained in the listed technologies
Ability to sit for long periods of time

Benefits

Comp & perks

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities
24/7/365 on-call rotation readiness (job requirement, not an extra compensation benefit)