Lead Network Engineer - Firewall Infrastructure

AMERICAN SYSTEMS

. Lead network engineering, administration, and operational support activities in a highly classified environment .

Posted 10/12/2026full-timeDallas • Texas • United StatesSenior💰 $155,000 - $180,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in network engineering and administration, with a strong focus on enterprise network infrastructure, firewall management, and compliance with security standards. Proven ability to lead technical efforts, troubleshoot complex network issues, and provide mentorship to engineering teams.

Highest-signal resume keywords

Network EngineeringFirewall AdministrationCisco FirepowerDoD 8140/8570 IAT Level II CertificationCCNA Certification

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Network InfrastructureRouting and SwitchingLayer 2 and Layer 3 TroubleshootingVLANsSubnettingIP AddressingAccess Control Lists (ACLs)VPN TechnologiesNetwork SegmentationResilient Network Architectures

Soft Skills

Technical LeadershipMentoringWritten CommunicationVerbal Communication

Tools & Technologies

Cisco ISEPalo Alto NetworksFortinetCheck PointCisco Firepower Management Center

Certifications & Qualifications

Top Secret ClearanceSecurity+ CECySA+SSCP

Industry Keywords

AAA802.1XNetwork Access ControlRMFSTIGSecure ConfigurationVulnerability RemediationIncident Response

Tech Stack

Tools & technologies

Cyber SecurityFirewallsSwitching

About the role

Key responsibilities & impact

Lead network engineering, administration, and operational support activities in a highly classified environment
Design, implement, configure, and maintain enterprise network infrastructure, including routers, switches, firewalls, VLANs, ACLs, VPNs, network segmentation, and high-availability architectures
Administer, monitor, troubleshoot, and maintain enterprise firewall environments
Configure and manage firewall policies, access rules, NAT, VPNs, security zones, logging, and monitoring
Support and troubleshoot Cisco Firepower and Firepower Management Center
Troubleshoot complex Layer 2 and Layer 3 issues involving routing, switching, firewall connectivity, access controls, and enterprise network services
Support AAA, authentication, authorization, accounting, and network access control requirements
Configure and troubleshoot 802.1X, VPN, and NAC solutions
Support Cisco ISE environments, including authentication, authorization, policy enforcement, and network access control
Support network-related RMF, STIG, secure configuration, vulnerability remediation, and compliance activities
Develop and maintain network diagrams, implementation plans, standard operating procedures, configuration documentation, and technical reports
Partner with cybersecurity, systems administration, and mission teams to deliver reliable and resilient network services
Support network outages, root cause analysis, change implementation, remediation efforts, and incident-response activities
Monitor network performance and recommend improvements to availability, reliability, performance, and infrastructure resiliency
Provide technical leadership, mentoring, and guidance to network engineering and operations personnel

Requirements

What you’ll need

U.S. citizenship required
Active Top Secret clearance required, with eligibility to obtain SCI and SAP access
Bachelor’s degree in a related technical field, or additional relevant experience in lieu of a degree
8+ years of experience in network engineering, network operations, network infrastructure, or firewall administration
Active DoD 8140/8570 IAT Level II certification, e.g., Security+ CE, CySA+, SSCP, or an equivalent certification
Active CCNA certification or higher-level Cisco networking certification
Strong hands-on experience with enterprise network infrastructure, routing and switching, Layer 2 and Layer 3 troubleshooting, VLANs, subnetting, IP addressing, network design, ACLs, VPN technologies, network segmentation, and resilient network architectures
Hands-on experience administering and troubleshooting enterprise firewall platforms
Experience with one or more enterprise firewall technologies, including Cisco Firepower/FMC, Palo Alto Networks, Fortinet, or Check Point
Experience with firewall policy administration, rule management, NAT, VPNs, security zones, logging, monitoring, and troubleshooting
Experience supporting AAA, 802.1X, network access control, RMF, STIG, and secure configuration requirements
Experience with Cisco ISE, particularly authentication, authorization, accounting, policy enforcement, and network access control
Experience troubleshooting Cisco routers, switches, firewalls, and enterprise network infrastructure
Ability to work independently, lead technical efforts, and resolve complex network and firewall infrastructure issues
Strong written and verbal communication skills

Benefits

Comp & perks

Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance
100% employee-owned company