<![CDATA[The rapid development of digital technology has encouraged micro, small, and medium enterprises (MSMEs) to adopt e-commerce platforms to improve marketing and sales activities. This study aims to develop and evaluate a mobile-responsive web-based e-commerce system for Snackwar, integrating digital product promotion with the Shopee marketplace. The system was developed using the Waterfall methodology, consisting of requirements analysis, system design, implementation, testing, and maintenance. Unified Modeling Language (UML) diagrams were employed to model system functionality, while PHP, MySQL, HTML, CSS, and JavaScript supported system implementation. The developed platform provides product catalogs, detailed product information, promotional features, and marketplace purchasing links. System evaluation incorporates black-box testing and user questionnaires to assess functionality, usability, and user satisfaction. The proposed system is expected to improve product accessibility, simplify promotional activities, and support digital sales management. This research contributes a practical mobile commerce solution for strengthening MSME digital transformation and marketplace connectivity.]]>
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