Location US-TX-Dallas

ID 2026-5040

AMERICAN SYSTEMS, a 100% employee-owned federal government contractor, is seeking a Lead Network Security Engineer to support a critical national security mission in a highly classified environment in Dallas, TX. This position requires the ability to work independently in a complex, security-focused environment.

We’re seeking an experienced network professional with strong hands-on experience in enterprise networking, network security, firewall administration, and infrastructure troubleshooting. Experience administering and troubleshooting enterprise firewall technologies is required, including platforms such as Cisco Firepower, Firepower Management Center, Palo Alto, Fortinet, Check Point, or similar solutions. Experience with Cisco ISE, network access control, authentication, authorization, or 802.1X is also valued.

As a Lead Network Security Engineer, you will:

• Lead secure network engineering, administration, and operational support in a highly classified environment.
• Design, implement, configure, and maintain enterprise network infrastructure, including:
  • Routers and switches | Firewalls | VLANs | ACLs | VPNs
  • Network segmentation | 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 (FMC). Cisco Firepower experience is preferred.
• 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. Cisco ISE experience is preferred.
• 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.

• 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
  • Access control lists, or ACLs | Network addressing and design | VPN technologies
  • Network segmentation | Resilient network architectures
• Hands-on experience administering and troubleshooting enterprise firewalls.
• Experience with one or more of the following firewall platforms:
  • Cisco Firepower and 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, RMF, STIG, secure configuration, and network access control requirements.
• Cisco ISE experience preferred, particularly with:
  • Authentication | Authorization | Accounting
  • Policy enforcement | Network access control
• 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.

Additional Experience We Value

The following experience is helpful but not required:

• Experience supporting highly compartmented or special-access classified environments.
• Cisco certifications, including CCNA, CCNP Enterprise, CCNP Security, or CCIE.
• Experience with Palo Alto, 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 refresh, or network migration efforts.
• Experience with incident response, change management, outage resolution, and root cause analysis in classified environments.
• Familiarity with VMware or other virtualized environments.
• Experience developing technical documentation, network diagrams, implementation plans, and standard operating procedures.

AMERICAN SYSTEMS is committed to pay transparency for our applicants and employee-owners. The salary range for this position is USD $155,000.00/Yr. - USD $180,000/Yr. Actual compensation will be determined based on several factors permitted by law. AMERICAN SYSTEMS provides for the welfare of its employees and their dependents through a comprehensive benefits program by offering healthcare benefits, paid leave, retirement plans, insurance programs, and education and training assistance.

EEO Race/Sex/Disability Status/Veteran Status

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