Worked on the PicnicSupermarket/error-prone-support repository to standardize the use of Immutable collection builders in Java codebases. Developed and implemented new Refaster rules that enforce consistent builder patterns for ImmutableListMultimap, ImmutableSetMultimap, ImmutableMap, and ImmutableTable, focusing on reducing boilerplate and improving code readability. Leveraged expertise in code refactoring, static analysis, and the Refaster DSL to align builder usage with project guidelines and lay groundwork for future maintainability. This effort addressed issue #2038 as part of a broader initiative, enhancing code quality and consistency while making onboarding and future refactoring more straightforward for the development team.