Network Security Engineer Senior

Govcio-posted about 16 hours ago
Full-time • Mid Level
Hybrid • Kearneysville, WV
1,001-5,000 employees
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GovCIO is seeking an experienced Network Security Engineer (Senior) to provide critical support for our U.S. Coast Guard program. This position will be located in Kearneysville, WV and will be a hybrid remote position. The ideal candidate will specialize in designing, implementing, and maintaining our secure network infrastructure with a core focus on Zero Trust Architecture and Network Access Control (NAC). This role is critical for protecting high-value assets within large-scale U .S. Coast Guard enterprise environments, including NIPRNet, SIPRNet and DDIL. You will be a subject matter expert on Cisco ISE, and responsible for the full lifecycle of our C2C and 802.1x NAC solutions in a fast-paced, high-stakes environment.

  • Cisco ISE Administration and NAC Support Configure, maintain , and optimize Cisco Identity Services Engine (ISE) for robust authentication, authorization and accounting (AAA)
  • Administer and maintain the full ISE deployment, including Policy Service Nodes (PSNs), Monitoring and Troubleshooting Nodes ( MnTs ) and the Primary Admin Node (PAN)
  • Implement and support 802.1X, MAB (MAC Authentication Bypass), posture assessment and advanced profiling for comprehensive endpoint security
  • Configure and manage Cisco ISE Guest Access, BYOD policies, and endpoint device profiling.
  • Perform routine ISE system updates, patches, and health checks to ensure optimal system stability and performance, including executing the node upgrade process
  • Monitor and analyze RADIUS, TACACS+, LDAP, and Active Directory authentication logs to ensure security compliance and troubleshoot performance issues
  • Expertly troubleshoot complex authentication failures, endpoint misclassifications, and network access issues
  • Network Security and Compliance Support Ensure all Network Access Control (NAC) enforcement strictly aligns with DoD Comply to Connect (C2C) policies and DISA STIGs
  • Implement and support device posture validation, MSFT Defender, Tanium, dynamic ACL ( dACL ) provisioning, dynamic VLAN assignments and Security Group Tagging (SGT)
  • Collaborate with network and security teams to design and enforce Zero Trust security models and the principle of least privilege access
  • Assist in implementing and troubleshooting certificate-based authentication (TLS/SSL, OpenSSL operations and PKI infrastructure)
  • Conduct deep-dive traffic analysis using tools like Wireshark, TCPDump and SolarWinds to diagnose authentication issues and identify network anomalies
  • Firewall and Infrastructure Integration Support the seamless integration of Cisco ISE with security and network platforms, including Cisco Firepower, ASR/ISR/CSR/ASA firewalls, VERSA and Palo Alto NGFWs
  • Assist in troubleshooting NAC-related network performance issues that affect LAN/WAN connectivity
  • Provide expert support for multi-VRF environments, ensuring proper NAC enforcement across complex and segmented network topologies
  • Bachelor’s degree in computer science, information systems or a related field with 8+ years (or commensurate experience).
  • 5+ years of dedicated experience in network security, NAC or related roles.
  • A minimum of 3+ years of direct, hands-on experience in Cisco ISE administration, NAC policy management and network authentication security.
  • Clearance Required: Must be cleared up to an active Secret clearance.
  • Current DoD 8570 IAT Level II certification (e.g., Security+ CE, CCNA Security, SSCP)
  • Deep expertise in Cisco ISE architecture, profiling, posture assessment and endpoint classification
  • Proficient with 802.1X, MAB, RADIUS, TACACS+, LDAP and Microsoft Active Directory integration
  • Hands-on experience with Cisco Switch CLI for configuration and troubleshooting
  • Strong understanding of certificate-based authentication (PKI, TLS/SSL, OpenSSL)
  • Framework & Tools Knowledge: Proven experience working within DoD cybersecurity compliance frameworks (e.g., DISA STIGs, NIST 800-53, IAVMs).
  • Familiarity with Cisco Firepower, ASA firewalls , and Palo Alto NGFWs.
  • Basic scripting knowledge (Python, Bash, or REST APIs) for automation and troubleshooting is a significant plus.
  • Employee Assistance Program (EAP)
  • Corporate Discounts
  • Learning & Development platform, to include certification preparation content
  • Training, Education and Certification Assistance
  • Referral Bonus Program
  • Internal Mobility Program
  • Pet Insurance
  • Flexible Work Environment
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