<![CDATA[Alumni management plays an important role in strengthening institutional sustainability and engagement in educational environments. However, many educational institutions still manage alumni data manually, resulting in inefficient communication, data fragmentation, and limited interaction between alumni and institutions. This study aims to design and implement a mobile-based alumni relationship management system using the Extreme Programming method to enhance digital engagement in Islamic boarding school education. The research applies a qualitative approach with data collected through observation, interviews, and literature study to identify system requirements. The system is developed using Flutter for mobile applications, React JS for the web-based admin panel, and Firebase as the backend infrastructure. The development process follows Extreme Programming stages, including planning, design, coding, and testing. System evaluation is conducted through Black Box Testing and User Acceptance Testing involving 16 alumni respondents. The results show that the system functions effectively and achieves a user acceptance score of 92.5%, categorized as very good. The study concludes that the proposed system successfully improves alumni data management, strengthens communication, and supports digital transformation in educational institutions.]]>
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