Network Engineer, Lead - Firewall Infrastructure | Top Secret w​/SCI eligibility

AMERICAN SYSTEMS, a 100% employee-owned federal government contractor, is seeking a
Lead Network Engineer, Firewall Infrastructure to support a critical national security mission in a highly classified environment in Dallas, TX.

This is a hands-on network engineering role focused on enterprise firewall infrastructure
, routing and switching
, secure connectivity
, and network access control
. The selected candidate will lead the configuration, administration, troubleshooting, and operational support of a complex enterprise network environment.

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.

• 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…