<![CDATA[Sales information systems are part of management information systems that function to manage sales transaction data, inventory, customers, and financial reports automatically and in an integrated manner. This study aims to design a web-based sales information system at PT Patin Nusantara Globalindo Deli Serdang using the Software Development Life Cycle (SDLC) method. The company faces several issues, including manual transaction recording, product data management, and report generation processes, which lead to delays, data inaccuracies, and difficulties in decision-making. The SDLC method is selected due to its structured and systematic stages, including analysis, design, implementation, and testing. Data collection techniques consist of observation, interviews, and literature studies to obtain accurate system requirements. The proposed system includes features for product data management, sales transactions, stock control, and integrated sales reporting within a web-based platform. The results indicate that the developed system improves operational efficiency, minimizes recording errors, and provides faster, more accurate, and accessible information to support managerial decision-making. Therefore, the implementation of this system is expected to enhance overall company performance.]]>
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