Toko Tiga Saudara still manages transactions and stock manually using physical notes and Microsoft Excel, causing delayed reports, difficulties in real-time stock monitoring, and operational miscommunications. This study aims to develop a web-based store management information system that integrates cashier processes, stock management, online ordering, and reporting. The development method uses the Waterfall model through problem analysis (PIECES), requirements analysis (Use Case), design (UML, ERD, DFD), web implementation with Laravel and MySQL, and Black Box testing with 15 test scenarios involving 3 testers (cashier, manager, owner) to ensure data validity. The results show that the system successfully facilitates user roles (manager, owner, customer, courier) with real-time catalog, shopping cart, online ordering, stock adjustment requests, delivery validation, and analytical reports. All main features (login, transactions, receipt printing, order cancellation, stock validation, etc.) function as required. The implementation provides a digital solution for previously manual store management, improving operational efficiency, data accuracy, and supporting managerial decision-making.
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