Sr. L4 Network Engineer/Architect

Key Responsibilities

Cisco SD-WAN Architecture and Solution Definition

• Lead the design and definition of Cisco SD-WAN solutions for enterprise and mission-critical environments.
• Develop SD-WAN architectures using MPLS, Internet, broadband, LTE/5G, private-line, and hybrid WAN transport models.
• Define how Cisco SD-WAN overlays will operate across existing and future WAN underlays.
• Design SD-WAN control, data, and management plane architecture using Cisco SD-WAN components such as vManage, vBond, vSmart, and Cisco WAN Edge routers.
• Build and validate SD-WAN policies for application-aware routing, traffic steering, segmentation, path preference, SLA-based forwarding, failover, and resiliency.
• Define transport-side and service-side VPN designs, including how WAN edge devices connect into LAN, firewall, data center, and cloud environments.
• Lead SD-WAN migration planning from legacy WAN or MPLS-centric environments to modern Cisco SD-WAN architectures.
• Establish SD-WAN design standards, implementation templates, validation methods, and operational handoff documentation.

Cisco SD-WAN Deployment and Operations

• Configure, deploy, troubleshoot, and support Cisco SD-WAN environments using centralized templates, policies, and device-level configurations.
• Support Cisco SD-WAN edge platforms, including Cisco Catalyst 8000/8500, ISR, ASR, and other IOS-XE SD-WAN-capable platforms.
• Troubleshoot SD-WAN control connections, tunnel formation, BFD behavior, policy application, routing advertisements, NAT traversal, certificate issues, and overlay reachability.
• Validate application performance across multiple WAN transports using routing, SLA, QoS, and performance monitoring tools.
• Support high-risk SD-WAN cutovers, site migrations, circuit transitions, and production troubleshooting events.
• Partner with security, LAN, cloud, voice, application, and carrier teams to ensure SD-WAN designs meet business and technical requirements.

WAN, MPLS, and Routing Integration

• Design and support WAN environments that include MPLS, carrier Ethernet, Internet, broadband, private fiber, and hybrid transport models.
• Understand how Cisco SD-WAN operates over MPLS underlays, including transport VPN design, routing exchange, path selection, QoS treatment, and failover behavior.
• Support MPLS-related routing requirements, including L3VPN, L2VPN, VRF segmentation, PE/CE routing, route targets, route distinguishers, and carrier handoff models.
• Configure and troubleshoot advanced routing using BGP, OSPF, IS-IS, EIGRP, route redistribution, route filtering, prefix lists, route maps, communities, and routing policies.
• Work with carriers and service providers to validate circuit delivery, MPLS routing handoffs, CE/PE demarcation, SLA performance, and escalation of provider-side issues.
• Ensure WAN routing designs support SD-WAN overlay requirements, application performance, segmentation, and resiliency objectives.

WAN/LAN Edge and Physical Handoff Integration

• Define how WAN services terminate into customer environments, including routers, switches, firewalls, optical handoffs, and LAN aggregation points.
• Validate WAN/LAN interface designs involving routed handoffs, VLAN tagging, trunking, port channels, VRFs, firewall zones, and segmentation boundaries.
• Understand how fiber-based services are delivered into a site, including carrier demarcation, cross-connects, patching, optics, transceivers, and handoff types.
• Work with field teams and providers to validate fiber paths, patch schedules, port assignments, light levels, media types, and physical connectivity.
• Troubleshoot physical and Layer 1/Layer 2 issues involving fiber, optics, dirty connectors, incorrect transceivers, speed/duplex mismatches, VLAN tagging, port configuration, and cabling errors.
• Ensure SD-WAN edge devices are properly integrated with upstream carrier services and downstream LAN, firewall, and data center infrastructure.

High Availability, Resiliency, and Performance

• Design resilient SD-WAN and WAN architectures using dual circuits, diverse carriers, redundant WAN edge devices, diverse fiber paths, HA designs, and multiple transport types.
• Define failover and traffic-steering behavior between MPLS, Internet, broadband, LTE/5G, and private transport options.
• Implement and validate QoS strategies across SD-WAN, MPLS, and LAN/WAN handoff points.
• Support voice, video, business-critical applications, operational technology, cloud services, and venue-specific traffic requirements.
• Validate latency, jitter, packet loss, throughput, convergence, tunnel stability, and application performance across the WAN.
• Use Cisco SD-WAN analytics, packet captures, flow data, SNMP/telemetry, ThousandEyes, router diagnostics, provider test results, and optical test data to isolate and resolve issues.

Senior L4 Escalation and Technical Leadership

• Serve as the senior escalation point for complex Cisco SD-WAN, WAN routing, MPLS integration, carrier handoff, and WAN/LAN edge issues.
• Lead root-cause analysis for high-impact or recurring network incidents.
• Provide technical direction to L1 L3 engineers, field teams, project managers, vendors, and client stakeholders.
• Review proposed designs and changes for technical accuracy, risk, resiliency, operational impact, and alignment with architecture standards.
• Lead technical bridges during major incidents, circuit turn-ups, SD-WAN migrations, maintenance windows, and cutover events.
• Communicate clearly with both technical and non-technical audiences, including client leadership and executive stakeholders.

Documentation, Standards, and Governance

• Produce and maintain high-quality technical documentation, including HLDs, LLDs, SD-WAN design documents, routing diagrams, WAN topology diagrams, IP addressing plans, implementation plans, test plans, and as-built documentation.
• Document Cisco SD-WAN policies, templates, device roles, transport mappings, VPN designs, routing behavior, and failover logic.
• Document WAN/LAN handoffs, carrier demarcation points, fiber cross-connects, optics, port assignments, circuit IDs, and provider escalation information.
• Create repeatable standards for SD-WAN deployment, WAN edge integration, circuit validation, migration planning, and operational readiness.
• Support change management, risk reviews, technical governance, and knowledge transfer activities.

Required Qualifications

• 10+ years of enterprise or service provider network engineering experience, with significant hands-on responsibility for WAN, routing, and production network environments.
• Strong hands-on experience designing, deploying, and troubleshooting Cisco SD-WAN solutions.
• Strong understanding of Cisco SD-WAN architecture, including overlay/underlay design, vManage, vBond, vSmart, WAN edge routing, templates, policies, and centralized management.
• Experience building Cisco SD-WAN solutions over MPLS, Internet, broadband, LTE/5G, and hybrid WAN transports.
• Strong routing expertise with BGP, OSPF, IS-IS, EIGRP, route redistribution, route filtering, route maps, prefix lists, communities, and policy-based routing.
• Working knowledge of MPLS services, including L3VPN, L2VPN, VRFs, PE/CE routing, QoS, and carrier handoff models.
• Hands-on experience with Cisco WAN edge and routing platforms such as Cisco Catalyst 8000/8500, ASR, ISR, or equivalent enterprise/service provider platforms.
• Strong understanding of how WAN circuits physically terminate into customer environments, including carrier handoffs, fiber, optics, routers, switches, firewalls, and LAN aggregation devices.
• Ability to troubleshoot across multiple layers, including physical fiber, carrier services, routing, SD-WAN overlays, QoS, firewall integration, and application performance.
• Experience leading technical cutovers, site migrations, WAN transformations, circuit turn-ups, and high-risk maintenance windows.
• Ability to create clear technical documentation, diagrams, implementation plans, validation plans, and operational handoff materials.
• Strong communication skills with the ability to explain Cisco SD-WAN, WAN, routing, and fiber concepts to technical teams, project teams, and client stakeholders.