Designed and developed a production software system supporting inventory and sales operations for a retail electric bicycle business. Key Contributions: Designed relational database schemas and inventory tracking workflows. Implemented FIFO stock allocation logic ensuring accurate product rotation and transaction consistency. Built validation logic to maintain integrity across inventory, sales, and service records. Developed structured reporting and transaction workflows supporting daily retail operations. Delivered the application through the full software development lifecycle, including requirements analysis, development, testing, and deployment. Maintained version control and documentation to support future enhancements. Impact: Delivered a working operational system used to manage real inventory and service records.