Worked on the KlubJagiellonski/pola-backend repository to refine the API response structure for the get_by_code endpoint, focusing on improved data organization and maintainability. The update involved restructuring the JSON output so that brand details are now nested under each company, replacing the previous top-level all_company_brands field. This change, implemented using Python and YAML, streamlines client-side parsing and reduces integration complexity for downstream services. The approach emphasized backend development and careful refactoring to support future brand-related enhancements. No critical bugs were reported during this period, reflecting a focused and methodical engineering process centered on API design and maintainability.