Worked on the ankidroid/Anki-Android repository to enhance the whiteboard eraser feature, improving its accuracy during fast swipes by implementing coordinate tracking and line-segment intersection logic. This approach ensured that the eraser reliably removed paths even at high speeds, directly addressing user experience and responsiveness on the study screen. Additionally, developed regression tests for the card browser toolbar to verify correct title updates when rows are selected, strengthening UI reliability and reducing the risk of post-release issues. Utilized Kotlin for Android development, focusing on touch handling, UI/UX design, and unit testing to deliver robust and maintainable mobile features.