Alexey Rehov developed the Kopli Reactive Testnet Integration for the hyperlane-xyz/hyperlane-registry repository, focusing on expanding testnet support and improving onboarding for new chains. He implemented configuration management using yaml, modeling chain metadata such as block explorers, chain ID, native token, and RPC URLs to enable discovery and routing. His work included wiring domain routing ISM factories, interchain account routers, and mailboxes to align with Hyperlane’s interchain communication architecture. By ensuring repository-level traceability and adhering to established patterns, Alexey’s contribution enhanced QA coverage and reliability for testnet testing, demonstrating depth in Blockchain Development, DevOps, and Full Stack Development.