Senior OT Network Architect; SD-WAN​/Industrial Networks

We are seeking a highly experienced Senior OT Network Architect to lead the design and modernization of enterprise Operational Technology (OT) networks for a large-scale utility/critical infrastructure environment.

This is a hands‑on architecture role focused on designing secure, resilient, and scalable OT network infrastructures using SD‑WAN, segmentation, and industrial networking best practices.

• Design and implement segmented OT network architectures transitioning from flat Layer 2 networks to SD‑WAN‑enabled environments
• Develop enterprise WAN and SD‑WAN architectures including underlay/overlay design, QoS, resiliency, and path optimization
• Define network segmentation strategies using ISA/IEC 62443 zone and conduit models
• Design resilient ring topologies and high‑availability network solutions across substations and OT sites
• Architect secure OT environments with firewall zoning, micro‑segmentation, and least‑privilege access controls
• Support deployment and integration of SD‑WAN solutions with existing industrial switching infrastructure
• Conduct OT network risk assessments and support compliance initiatives including NERC CIP
• Lead troubleshooting, root cause analysis, and remediation for OT network issues
• Collaborate with infrastructure, cybersecurity, and operations teams to drive network modernization initiatives

• 10+ years of experience in enterprise network architecture and design
• Deep expertise in routing, switching, WAN, and network segmentation
• Experience working in OT/ICS/SCADA environments
• Background in utilities, power generation, oil & gas, manufacturing, or industrial environments strongly preferred
• Experience with industrial protocols such as DNP3, Modbus, OPC, Ethernet/IP, or IEC 61850
• Strong understanding of OT cybersecurity principles and IT/OT convergence
• Experience with Cisco networking technologies required
• Extreme Networks experience is a strong plus
• Excellent communication and stakeholder management skills

• CCNA / CCNP required
• CCIE preferred
• Security certifications are a plus

• Must be local to Manassas, VA or willing to relocate
• Must be able to work onsite daily
• Must be willing to attend an in‑person final interview
• US Citizen or Green Card Holder only

If you are an experienced Network Architect with strong OT and SD‑WAN expertise looking to work on critical infrastructure modernization initiatives, we’d love to hear from you.