Senior Routing & Switching Engineer Job Description Experience 8+ years Certification CCIE mandatory Primary Focus Cisco Nexus/Catalyst/ASR/8300, Aruba CX and Juniper switching Role Summary Senior network engineer responsible for implementation, migration and troubleshooting of enterprise and data-center routing/switching infrastructure across Cisco, Aruba and Juniper platforms. The role requires strong architecture awareness and hands-on execution during complex network cutovers. Key Responsibilities / Implementation Scope Design, configure and implement Layer 2/Layer 3 connectivity across data center, campus, branch, management, DMZ and external routing environments. Configure and migrate Cisco Nexus switching, including Nexus 9504 core, Nexus 9348 access and Nexus 93180YC platforms used in DMZ/access roles. Configure and support Cisco Catalyst 8000/9000 platforms, Cisco ASR 1002 and Cisco 8300 series external routers. Configure and migrate Aruba switching platforms including CX 6200, CX 6300, CX 8320 and related hardware such as JL479A and JL658A. Support Juniper switching where present, including legacy EX3300 and EX2200 devices identified in the environment. Implement and troubleshoot BGP, OSPF, static routing, route redistribution, route filtering, VRFs, HSRP/VRRP and policy-based routing as required. Configure VLANs, trunks, STP/RSTP/MST, EtherChannel/LACP, port-channels, inter-VLAN routing and network segmentation. Support connectivity integration with firewalls, load balancers, wireless, NAC, voice, cloud and security platforms. Perform hardware refreshes, network migrations and site/data-center cutovers with pre-checks, rollback procedures and post-change validation. Conduct packet-level troubleshooting, routing-path analysis, interface/error analysis and root-cause investigation for complex connectivity incidents. Prepare implementation plans, MOPs, test scripts, rollback plans, low-level designs and as-built documentation. Required Technical Skills Area Required Hands-on Experience Cisco Nexus Nexus 9504, 9348 and 93180YC; NX-OS operations, VLAN/VRF, vPC/port-channel concepts and data-center switching. Cisco Routing / Switching Catalyst 8K/9K, ASR 1002, Cisco 8300 series; enterprise LAN/WAN and external routing. Aruba Switching Aruba CX 6200/6300/8320 and relevant models such as JL479A/JL658A. Juniper Switching Juniper EX3300 and EX2200 operational support and migration exposure. Routing Protocols BGP, OSPF, static routing, route redistribution/filtering, VRF, HSRP/VRRP and policy-based routing. Layer 2 / Segmentation VLANs, 802.1Q trunking, STP/RSTP/MST, EtherChannel/LACP, port-channel, inter-VLAN routing and segmentation. Troubleshooting Packet capture, routing-path analysis, latency/loss analysis, interface errors, convergence and incident RCA. Certification Requirements Mandatory: Active CCIE certification is mandatory. CCIE Enterprise Infrastructure is preferred; legacy CCIE Routing & Switching is acceptable where valid/relevant. Preferred / Advantageous: Additional Cisco data-center, Aruba switching or Juniper certifications are advantageous. Required Deliverables Low-level network design and port/VLAN/routing configuration workbook Implementation runbooks and MOPs Network migration/cutover and rollback plans Connectivity and failover test scripts with results As-built diagrams/configurations and operational handover documentation