<![CDATA[This research aims to design and implement a backend system for a mobile warehouse management application that supports workflow automation based on the First Expired First Out (FEFO) principle. The manual recording of warehouse layouts using spreadsheets and the subjective determination of outbound goods triggers a high risk of errors in the distribution of Bottled Drinking Water (AMDK), which has been occurring at PT. Tirta Investama. This system was developed using native PHP programming language with MySQL database storage. The system development method applied is the Waterfall method, which includes requirement analysis, system design using UML and ERD, implementation, and testing. The result of this research is a centralized web service API that successfully automates the recording of inbound goods, outbound transactions, stock mutations, and real-time space capacity monitoring. Based on the testing results using Black Box Testing, all login authentication functions, CRUD operations on products, and user access management (Supervisor and Checker) were found to operate validly according to the scenarios. With this system in place, the operational management of the warehouse at PT Tirta Investama becomes more self-service, structured, and maintains product quality.]]>
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