<![CDATA[The operational sustainability of Rukun Tetangga (RT) administrative units, particularly in security, sanitation, and social welfare, depends heavily on the effective governance of cash funds. In RT 011/RW 01 Pondok Betung Village, financial recording still relies on manual ledger books and disconnected spreadsheet files, causing delays in monthly reporting and difficulties in tracking citizen arrears. This study aims to design and implement a web-based RT financial management system to substitute the conventional administration. The development methodology follows the Software Development Life Cycle (SDLC) using the Waterfall model, including system analysis, UML-based architectural design, and database relational modeling. The system architecture utilizes Laravel as a RESTful API backend integrated with React.js and Vite on the client side. The implementation results indicate that this web application effectively centralizes financial data, automates monthly balance sheets, and provides real-time transaction transparency for 120 households. Based on Black-box testing focusing on input, process, and output functions, all system features are declared valid and conform to local business rules. This study concludes that administrative digitalization enhances management accountability and significantly reduces citizens' contribution delays.]]>
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