Worked on the rathena/rathena repository to refactor chat room entry packet handling, focusing on converting ZC_ROOM_NEWENTRY from inline logic to a dedicated struct. This backend development effort in C++ improved code organization and maintainability, ensuring that chat room data was correctly packaged and delivered to clients without altering existing functionality. By decoupling parsing and packaging logic, the work enhanced testability and laid a foundation for future chat room feature development. The approach supported safer, faster iterations and easier code reviews, demonstrating skills in backend and network programming within a game development context over the course of the month.