Worked on the nrfconnect/sdk-zephyr repository to deliver a comprehensive cleanup of device tree macros, focusing on standardizing instance-number terminology throughout the codebase. This effort aligned macro usage with existing documentation and conventions, reducing ambiguity and improving overall code consistency. By addressing inconsistencies at the macro level, the work enhanced maintainability and lowered the risk of future refactoring in a critical embedded systems subsystem. Utilizing C programming and device tree management skills, the developer prioritized repository hygiene and long-term code quality, enabling safer evolution of macros and reducing potential downstream debugging efforts without introducing new features or bug fixes.