Worked on the kolmafia/kolmafia repository to enhance pricing accuracy within the Coinmaster flow by addressing a bug in the sell_price calculation. Focused on backend development using Java, the work involved updating logic to support modern Coinmaster ShopRow entries and ensure correct pricing retrieval. To maintain reliability, regression tests were added, specifically targeting the Kiwi Kwiki Mart scenario, which helped validate and lock in the corrected behavior. Emphasized continuous integration hygiene by running Gradle Spotless and updating tests, resulting in cleaner builds and improved code quality. The approach prioritized robust test coverage and business confidence in pricing data.