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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Network Engineer, Lead - Firewall Infrastructure | Top Secret w - **Company:** AMERICAN SYSTEMS - **Location:** Dallas, TX, United States - **Experience:** Expert - **Salary:** $155,000.0 - **Contract:** Permanent contract - **Skills:** IEEE 802.1X, Access Control List, Application Firewall, User Authentication, Cisco Routers, Complex Networks, Cyber Security, Computer Networks, Data Centers, Network Address Translation, IP Addressing, Subnetting, Virtual Private Networks (VPN), Network Troubleshooting, Network Layer, Network Architecture, Network Diagrams, Network Planning and Design, Network Monitoring, Routing, Network Segmentation, Network Service, Remote Access Technology, SAP (Applications), Virtual Local Area Networks, Virtualization Technology, Software Vulnerability Management, Data Logging, Network Routers, Authentication Authorization Accounting (Server Program), Computer Networking Systems, Identity Services Engine, Network Access Control, Computer Network Operations, Firewalls (Computer Science), Palo Alto Networks, Fortinet, Firepower, Firewall Services Module, Cisco, Vmware - **Published:** October 14, 2026 - **Apply:** https://www.clearancejobs.com/jobs/9232176/network-engineer-lead-firewall-infrastructure-top-secret-w ## About the Role * 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 Cisco Certified Network Associate (CCNA) certification or higher-level Cisco networking certification. * Strong hands-on experience with enterprise network infrastructure, including: + Routing and switching + Layer 2 and Layer 3 troubleshooting + VLANs, subnetting, IP addressing, and network design + Access control lists (ACLs) and VPN technologies + Network segmentation and resilient network architectures * Hands-on experience administering and troubleshooting enterprise firewall platforms. * Experience with one or more of the following firewall technologies: + Cisco Firepower and Firepower Management Center (FMC) preferred + Palo Alto Networks + Fortinet + Check Point + Other commercial or government enterprise firewall platforms * 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. * Cisco ISE experience preferred, particularly with: + Authentication + Authorization + Accounting + Policy enforcement + 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. Additional Experience We Value The following experience is helpful but not required: * Experience supporting highly compartmented or special-access classified environments. * Advanced Cisco networking certifications, such as CCNP Enterprise, CCNP Security, or CCIE. * Experience with Palo Alto Networks, Fortinet, Check Point, or other enterprise firewall technologies. * Experience with Cisco ISE, NAC, 802.1X, or related access control platforms. * Experience supporting network modernization, infrastructure upgrades, technology refreshes, network migrations, or data center transformation efforts. * Experience developing network diagrams, implementation plans, configuration documentation, and standard operating procedures. * Experience with network change management, outage resolution, root cause analysis, and incident response in classified environments. * Familiarity with VMware or other virtualized environments. Pay Transparency Statement ## Description We are seeking an experienced network professional with strong hands-on experience supporting routers, switches, firewalls, VLANs, VPNs, ACLs, network segmentation, and high-availability network architectures. Candidates should be comfortable resolving complex Layer 2 and Layer 3 network issues, administering firewall platforms, and maintaining reliable, resilient network services., As a Lead Network Engineer, Firewall Infrastructure with AMERICAN SYSTEMS, you will: * Lead network engineering, administration, and operational support activities in a highly classified environment. * Design, implement, configure, and maintain enterprise network infrastructure, including: + Routers, switches, and firewalls + VLANs, ACLs, VPNs, and network segmentation + High-availability, resilient network 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 (FMC). Cisco Firepower experience is preferred. * 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 related to network infrastructure. * 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.