Developed and delivered a complete testnet rollup environment for the Lotteria Lottery dApp within the initia-labs/initia-registry repository. Focused on blockchain and dApp development, the work involved configuring chain.json files, modeling asset lists, and integrating profile data to support realistic end-to-end testing scenarios. The implementation enabled more accurate testnet deployments, improved QA iteration speed, and enhanced deployment reliability for the Lotteria dApp. Leveraging skills in smart contract development and JSON-based configuration, the developer ensured that the testnet environment closely mirrored production requirements, facilitating robust user data modeling and comprehensive testing without addressing major bug fixes during this period.