During May 2025, John contributed to the john0312/hitcon-pcb-badge repository by enhancing the leaderboard functionality through a refined data model. He extended the ScoreEntry schema to capture both per-game and total scores, enabling more accurate and flexible leaderboard rankings. John also improved test automation by optimizing the fake client, updating API endpoints, and introducing utilities for fetching and posting scores, which increased test coverage and reliability. His work focused on backend development and data modeling using Python, with an emphasis on robust API development and testing. The depth of these changes strengthened both scoring accuracy and overall QA stability.