This study designs and implements a web-based information system for managing cadre data at the Himpunan Mahasiswa Islam (HMI) Tembilahan Branch. The study responds to handwritten and fragmented administrative practices that slow data retrieval, increase duplication risk, and weaken information control. Data were collected through direct observation at the branch secretariat, an interview with the branch chairman, and a literature review. System requirements were analyzed using the PIECES framework, while development followed the Waterfall model and was represented through Unified Modeling Language diagrams. The application was implemented with Laravel and MySQL and provides role-based access for administrators and the HMI chairman, covering member, commissariat, announcement, activation, position, and profile management. Functionality testing involved 25 respondents and 25 system functions, producing 625 successful executions and no failures, equivalent to a functionality value of 1. Usability testing with ten statements produced 1,095 of 1,250 possible points, or 87.64%, categorized as very good. The results indicate that the system is functionally reliable, usable, and suitable for supporting more organized cadre administration at HMI Tembilahan Branch.
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