During July 2025, Jihwan Kim delivered backend submodule integration for the woowacourse-teams/2025-feed-zupzup repository, focusing on establishing a modular architecture to support backend code reuse and separation of concerns. By introducing a dedicated Git submodule and configuring its path and URL, Jihwan enabled the integration of external backend components, laying the groundwork for scalable and maintainable backend development. The work involved careful management of repository structure and submodule wiring, leveraging Git and backend development best practices. While the contribution was limited to a single feature, it provided a foundational step toward cross-repository collaboration and reduced code duplication for future projects.