Rizqi worked on the lichess-org/mobile repository, focusing on improving the Puzzle Session widget’s user interface. Addressing a specific UI issue, Rizqi fixed inconsistent font sizing for the rating difference text, ensuring that typography remained stable and visually consistent across various mobile devices. The solution involved refining how text scales within its container, which reduced confusion during puzzle sessions and streamlined the quality assurance process. Using Flutter and Dart, Rizqi demonstrated a clear understanding of mobile UI typography and responsive design. The work was delivered as a focused, low-risk fix with a clean, traceable commit history, reflecting careful engineering practice.