. Completed about 60% of the new features during my tenure. Assisted the team in updating outdated and unmaintained libraries (Butter Knife, GreenDao) to more stable official Android libraries (ViewBinding, Room). This work improved the stability and security of the app. Assisted the team in refactoring inappropriate RxJava, such as removing nested usage. This work improved the efficiency and readability of the code. Introduced a more correct Model layer concept to the team and unified the app's data flow, which improved the maintainability of the code. Assisted the team in refactoring the code