Architect extensible, vendor-agnostic testing frameworks to validate control-plane convergence, data-plane behavior, failure recovery, scalability, performance, interoperability, upgrade and downgrade safety, and platform stability across multi-vendor networks. Provide technical leadership for complex network failures and live-site incidents, using telemetry, packet captures, logs, protocol state, topology, and hardware signals to isolate issues, identify systemic failure patterns, and drive corrective actions.