Perform advanced testing across 5G/LTE, Wi-Fi, broadband, IP networks, routers, gateways, modems, and CPE devices. Configure and validate routing, VPNs, LAN/WAN connectivity, and network protocols. Build and maintain repeatable testbeds, integrate firmware and OS builds, analyze wireless and system logs, troubleshoot connectivity issues, and produce test plans, defect reports, KPI dashboards, and root-cause analyses.