Yongkiy worked on backend reliability and data integrity for google/adk-java and google/adk-docs, focusing on session management and JSON output validation. He delivered memory-safe session deletion logic and enhanced test coverage in InMemorySessionService, reducing the risk of memory leaks and regressions. In google/adk-docs, he enforced strict JSON output formatting for the Capital Information Agent, ensuring downstream consumers receive valid, parseable data. Yongkiy’s approach emphasized clean code, atomic commits, and robust unit testing using Java and Markdown. His work improved maintainability and stability, demonstrating depth in backend development, session management, and test-driven development over a focused two-month period.