During February 2026, contributed to the moeru-ai/airi repository by implementing SSML Prosody Signed Percentage Formatting, focusing on improving the accuracy and consistency of speech synthesis output. Developed a toSignedPercent helper in TypeScript to ensure correct formatting of signed percentages for SSML prosody attributes such as pitch and volume, specifically adding a '+' prefix for positive values and preventing double minus signs. This feature was integrated through a Stage UI fix, leveraging front end development and state management skills within a Vue.js environment. The work addressed a nuanced formatting issue, enhancing the reliability of SSML attribute handling in the application.