Yusuke contributed to the traPtitech/traQ repository over a two-month period, focusing on backend development and code refactoring using Go and its standard library. He improved code quality by simplifying error handling in the GetChannels function, removing unnecessary control flow to enhance readability and maintainability without altering core behavior. In addition, he migrated random number generation utilities to math/rand/v2, updating both function calls and import paths to leverage the latest improvements. Yusuke also refactored test loops to use range-based iteration, making test code clearer and easier to maintain. His work emphasized stability, maintainability, and adherence to best practices.