Lead Network Security Engineer, Top Secret Clearance, SCI, SAP Eligibility

AMERICAN SYSTEMS

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

Posted 10/9/2026full-timeDallas • Texas • United StatesSenior💰 $155,000 - $180,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in secure 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 and collaborate with cross-functional teams to deliver resilient network solutions.

Highest-signal resume keywords

Network EngineeringFirewall AdministrationCisco Firepower/FMCActive TS/SCI ClearanceDoD 8140/8570 IAT II Certification

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Routing and SwitchingLayer 2 and Layer 3 TroubleshootingVLANs and SubnettingAccess Control Lists (ACLs)VPN TechnologiesNetwork SegmentationNetwork Performance Monitoring802.1X ConfigurationIncident ResponseTechnical Documentation

Soft Skills

Strong Written CommunicationStrong Verbal CommunicationIndependent WorkTechnical Leadership

Tools & Technologies

Cisco RoutersCisco SwitchesPalo Alto NetworksFortinetCheck Point

Certifications & Qualifications

Security+ CECySA+SSCP

Industry Keywords

Enterprise NetworkingNetwork SecurityHighly Regulated EnvironmentsDefenseIntelligence

Tech Stack

Tools & technologies

Cyber SecurityFirewallsSwitchingTypeScript

About the role

Key responsibilities & impact

Lead secure network engineering, administration, and operational support 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, and troubleshoot 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 networking, routing, switching, firewall, connectivity, and access-control issues
Support AAA, authentication, authorization, accounting, and network access-control requirements
Configure and troubleshoot 802.1X, VPN, and network-access-control solutions
Support Cisco ISE environments, including authentication, authorization, policy enforcement, and network access control
Support RMF, STIG, secure configuration, vulnerability remediation, and compliance activities
Develop and maintain network diagrams, implementation plans, SOPs, configuration documentation, and technical reports
Partner with cybersecurity, systems administration, and mission teams to deliver secure and resilient network solutions
Support incident response, outage resolution, root-cause analysis, change implementation, and network remediation efforts
Monitor network performance and recommend improvements to strengthen security, availability, reliability, and performance
Provide technical leadership and guidance to network engineering and operations personnel

Requirements

What you’ll need

U.S. citizenship required
Active TS/SCI clearance with SAP eligibility required
Bachelor’s degree in a related technical field, or additional relevant experience in lieu of a degree
Eight or more years of experience in network engineering, network operations, or network security
Experience working in enterprise, defense, intelligence, federal government, or highly regulated environments
Strong hands-on experience with enterprise networking, including routing and switching, Layer 2 and Layer 3 troubleshooting, VLANs and subnetting, ACLs, network addressing and design, VPN technologies, network segmentation, and resilient network architectures
Hands-on experience administering and troubleshooting enterprise firewalls
Experience with Cisco Firepower/FMC, Palo Alto Networks, Fortinet, Check Point, or other enterprise firewall platforms
Experience with firewall policy administration, rule management, NAT, VPNs, security zones, logging, monitoring, and troubleshooting
Experience supporting AAA, 802.1X, RMF, STIG, secure configuration, and network access control requirements
Active DoD 8140/8570 IAT II certification, such as Security+ CE, CySA+, SSCP, or equivalent certification
Experience troubleshooting Cisco routers, switches, firewalls, and enterprise network infrastructure
Ability to work independently, lead technical efforts, and resolve complex network and security 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