Developed and delivered the Custom Subtitle Delay Controls feature for the 5rahim/seanime repository, focusing on enhancing user control over subtitle timing. The work involved implementing incremental adjustment buttons and extending the input range beyond the previous ±2 seconds, allowing for more precise and accessible subtitle synchronization. The developer replaced the previous custom delay input with discrete controls, ensuring that preset selections update appropriately when custom changes are made. All related settings and UI flows were updated for consistency and maintainability. This feature was built using React, JavaScript, and TypeScript, with an emphasis on front end development and user experience.