I have developed payment and mileage services on a game platform service with a global user base of 3 million, based on Java & Spring for server backend development.I enjoy taking the initiative to solve problems within my team and company. I've strived to question and improve upon issues that were not previously recognized as such. My contributions to the team and company have included legacy refactoring and enhancements on various projects, as well as fostering communication.I prefer to develop using Test-Driven Development (TDD), which relies on stable table design, clean architecture, and unit test code. I have also introduced the concept of unit testing to my team to promote stable development and have contributed to the team by providing guidelines for writing test code.