Senior Network Security Engineer

Job Description We are looking for a highly experienced L3/L4 Network & Security Engineer with strong hands-on experience in Routing, Switching, Enterprise Firewalls, Network Implementation, Troubleshooting and Migration Projects . The candidate must be able to independently handle end-to-end network and firewall activities , including configuration, implementation, troubleshooting, upgrades, replacement and migration. Key responsibilities Palo Alto: Primary firewall technology and mandatory hands-on expertise. Cisco Firepower/FTD, Sophos and FortiGate are secondary firewall technologies. Palo Alto Panorama: Administration, configuration, centralized policy management, monitoring, troubleshooting and validation. Routers : Configuration, troubleshooting, upgrades, replacement and migration. Switches : Access, Distribution, Core and Data Center switching; configuration, troubleshooting, upgrades, replacement and migration. Routing : BGP, OSPF, EIGRP, Static Routing, PBR, VRF, route redistribution and route filtering. Switching : VLAN, trunking, STP/RSTP/MSTP, LACP/EtherChannel, HSRP/VRRP and VPC/MLAG. Firewall Configuration : Security policies, NAT, routing, VPN, HA, security profiles, objects, zones and logging. Firewall Migration : End-to-end migration from one firewall vendor/platform to another, including discovery, assessment, policy conversion/mapping, object migration, NAT, routing, VPN, testing, cutover, rollback and post-migration troubleshooting. Multi-Site Firewall Migration : Experience supporting or leading multi-site firewall migration and deployment activities, including site-wise planning, cutover, validation, rollback and post-cutover stabilization. Network Migration : Core, Distribution, WAN, Internet Edge and Data Center migrations, including IP, VLAN and routing migrations. Implementation : Greenfield and existing-environment deployments, including end-to-end implementation, testing and validation. Troubleshooting : Device-level, protocol-level, packet-level and end-to-end application connectivity troubleshooting across network and firewall infrastructure. Major Incidents : P1/P2 incident troubleshooting, resolution, escalation management and Root Cause Analysis (RCA). Network & Firewall Optimization : Network performance, routing, firewall rules, HA, capacity and architecture optimization. SOW & Technical Validation : Ability to technically review and validate the SOW, proposed solution, HLD/LLD, implementation approach, dependencies, risks and technical requirements. Design Review : Review network and firewall designs and provide technical recommendations before implementation or migration. Migration Planning & Cutover : Develop and review migration plans, MOPs, test plans and rollback procedures; support planned production cutovers, including night/weekend maintenance windows when required. Post-Migration Stabilization : Perform post-cutover validation, troubleshooting, issue resolution and stabilization of the network and firewall environment. Customer-Facing Activities : Work directly with customers, technical stakeholders and project teams for requirements, design discussions, technical reviews, migration planning, implementation and issue resolution. Knowledge Transfer : Conduct knowledge-transfer sessions and provide technical handover Location : Āthiyūr, Tennessee, India