Worked on the microsoft/kiota-dart repository to enhance JSON parsing reliability by addressing a critical type casting issue that previously caused runtime errors when handling mixed numeric types. Applied robust error handling and type casting strategies in Dart, utilizing double.tryParse and int.tryParse to safely process numeric values and prevent crashes. Developed comprehensive unit tests to verify correct handling of null and valid numeric inputs, ensuring edge cases were covered. This work improved the stability and data integrity of generated API clients, demonstrating strong skills in Dart, JSON parsing, and test-driven development while raising the overall maintainability of the codebase.