Hoang Van Chinh developed the foundational Battleship core framework for the d23-java/seabattle repository, delivering a complete, interactive console-based game in Java. He designed and implemented object-oriented Player and Ship data structures, established modular display and processing components, and created a starting screen to guide users into gameplay. His work focused on building reliable ship placement and firing mechanics, ensuring a smooth and testable game flow without requiring bug fixes during the period. By prioritizing architecture and maintainability, Hoang enabled future enhancements such as AI, multiplayer, and UI features, providing a robust base for ongoing game development and QA.