Alexey Rehov developed and integrated Kopli Reactive Testnet support within the hyperlane-xyz/hyperlane-registry repository, focusing on robust configuration management and metadata modeling for blockchain environments. He implemented domain routing ISM factories, interchain account routers, and mailboxes, ensuring seamless testnet onboarding and end-to-end testing. Using yaml and leveraging skills in Blockchain Development and DevOps, Alexey added detailed chain metadata, including block explorers, chain IDs, native tokens, and RPC URLs, to enhance discovery and routing. His work aligned new testnet wiring with existing interchain communication patterns, improving QA coverage and reducing onboarding time for new chains without introducing major bugs.