Cybersecurity Network Engineer

IPSecure, Inc. is seeking a Cybersecurity Network Engineer to support the design, integration, configuration, testing, and security of advanced lab-based network infrastructure. This onsite role in San Antonio, TX focuses on building secure enterprise network environments and validating changes before they reach production or mission systems.

The position requires an Active TS/SCI security clearance and strong, hands‑on experience with Cisco ACI/SDN as well as enterprise routing, switching, and firewall engineering.

• Design, configure, integrate, secure, and troubleshoot enterprise network infrastructure within a lab and test environment.
• Engineer and support Cisco ACI architectures
  , including APIC controllers
  , leaf/spine architectures
  , tenants
  , VRFs
  , bridge domains (BDs),
  endpoint groups (EPGs),
  contracts
  , and external connectivity
  .
• Support Software-Defined Networking (SDN) technologies and network automation concepts used to centrally manage and secure network infrastructure.
• Configure and troubleshoot Cisco routers and switches
  , including Layer 2 and Layer 3 networking.
• Develop and maintain IP addressing and subnetting schemes, VLANs, VRFs, routing domains, and network segmentation strategies.
• Configure and troubleshoot routing protocols such as BGP
  , OSPF
  , and static routing.
• Engineer and support enterprise firewall and network security solutions, including security policies, access control rules, NAT, VPN connectivity, network segmentation, and traffic inspection.
• Analyze network traffic and connectivity using packet captures
  , logs, monitoring platforms, and other network diagnostic tools.
• Perform cybersecurity hardening of network infrastructure in accordance with applicable security requirements and organizational standards.
• Identify network vulnerabilities, configuration weaknesses, unnecessary services, and segmentation issues and recommend remediation.
• Support Zero Trust and defense-in-depth network architectures, including segmentation and least-privilege communications between systems and security zones.
• Build and maintain representative network environments used for integration, testing, troubleshooting, cybersecurity validation, and engineering development.
• Create and maintain network diagrams, interface documentation, IP address plans, configuration documentation, test procedures, and engineering artifacts.
• Conduct configuration testing and validation prior to implementation within production or mission environments.
• Troubleshoot complex connectivity issues across routers, switches, firewalls, virtual networks, servers, and applications.
• Coordinate with cybersecurity, systems, virtualization, application, and engineering teams to identify and resolve cross-domain infrastructure issues.
• Support change management, configuration management, technical documentation, and engineering review processes.

• Active TS/SCI security clearance
  .
• Bachelor’s degree in Information Technology, Computer Science, Cybersecurity, Information Systems, Engineering, or a related discipline.
• Equivalent experience may be substituted.
• Security+ and CCNA certification.
• 10+ years of experience in network engineering, cybersecurity engineering, network security, or a related technical field.
• Demonstrated hands‑on experience configuring and troubleshooting enterprise routers, switches, and firewalls.
• Demonstrated experience with Cisco ACI and Software-Defined Networking (SDN).
• Strong understanding of IP networking, routing, switching, subnetting, VLANs, and network segmentation.
• Experience supporting complex lab, integration, test, development, or production network environments.
• Experience working with virtualized infrastructure.
• Strong troubleshooting and root‑cause analysis skills.
• Ability to develop…