Over two months, contributed to DEFRA/btms-gateway and DEFRA/btms-backend by enhancing test coverage, improving data transformation reliability, and refining test infrastructure. Expanded XML to JSON converter tests to handle complex nested lists, ensuring accurate data processing using C# and JSON. Improved maintainability by removing extraneous code and fixing minor defects. In DEFRA/btms-backend, implemented scenario generators and data-driven tests for CHED unmatched handling, addressed string-to-enum serialization issues with JsonStringEnumConverter, and strengthened test automation with xUnit. Refactored test infrastructure for better CI reliability and maintainability, demonstrating a methodical approach to backend development, integration testing, and configuration management.