<![CDATA[The development of information technology in the digital era provides a great opportunity for business actors to improve service quality, operational efficiency, and expand marketing reach through the use of e-commerce platforms. However, Bakso Koko as a culinary business still uses a conventional ordering and payment system, which often causes various obstacles such as slow service processes, a high risk of transaction recording errors, difficulties in managing order data, and limitations in reaching a wider customer base. These problems indicate the need for a more effective, integrated, and easily accessible system for customers. This study aims to design and build an Android-based Bakso Koko e-commerce application integrated with a payment gateway so that the ordering and payment process can be carried out online more easily, quickly, safely, and efficiently. The system development method used in this study is the Waterfall method which includes the stages of requirements analysis, system design, implementation, testing, and maintenance. The analysis technique used is system requirements analysis through observation and interviews to understand the ongoing business process, then modeled using the Unified Modeling Language (UML) in the form of use case diagrams and activity diagrams. The research results show that the application was successfully designed and built with user registration, a product catalog, a shopping cart, ordering, online payment, order status tracking, and integrated product and transaction data management. This system is expected to improve service efficiency, transaction efficiency, and expand the business's marketing reach.]]>
