Worked on the google/adk-java repository over a two-month period, focusing on enhancing backend reliability and observability. Integrated OpenTelemetry Dev UI tracer into the core engine to enable comprehensive telemetry collection, improving workflow monitoring and error detection. Addressed data handling robustness by refining MIME type processing in the LangChain4j adapter, reducing runtime errors and supporting diverse text formats. In subsequent work, exposed Anthropic Claude token usage metadata in API responses, enabling accurate cost tracking and improved debugging. Employed Java, API integration, and unit testing throughout, with a technical approach centered on error handling, end-to-end validation, and maintainable backend development practices.