Worked on a targeted refactor of the pymc-labs/pymc-marketing repository, focusing on centralizing fit_result handling within the Model Builder to streamline data access across the MMMModelBuilder and CLV modules. This effort involved removing duplicate attributes and functions, unifying error messages for consistent debugging, and realigning tests to match the updated structure. By consolidating data access and eliminating redundancies, the changes improved code organization and maintainability, setting the stage for faster feature development and more reliable analytics pipelines. The work was accomplished using Python, with an emphasis on code refactoring and testing to ensure robust and maintainable engineering outcomes.