Developed the core engine for a Battleship game in the d23-java/seabattle repository, delivering a production-ready command-line interface that establishes a solid foundation for future enhancements and testing. Focused on clean, maintainable design using Java and object-oriented programming principles, the work included implementing board initialization, ship placement, turn-based gameplay, and winner determination. Emphasized a design-first approach by incorporating UML diagrams and structured commits to support future refactoring. The project prioritized clarity in code structure and commit history, ensuring the game logic and CLI user interface are both robust and extensible for ongoing development in game development contexts.