Worked on the hyperlane-registry repository to deliver Kopli Reactive Testnet Integration, enabling comprehensive end-to-end testnet testing for the Hyperlane Registry project. Developed and configured testnet support by modeling chain metadata, including block explorers, chain ID, native token, and RPC URLs, and implemented domain routing ISM factory, interchain account router, and mailbox components. Focused on YAML-based configuration management and repository-level change tracking to ensure traceability and maintainability. This integration aligned with existing interchain communication patterns, improving onboarding efficiency for new chains and enhancing QA coverage. Utilized skills in Blockchain Development, DevOps, and Full Stack Development throughout the process.