<![CDATA[Conventional inventory management at PT. Harta Jaya triggers various operational challenges, including stock data discrepancies, a high risk of physical record loss, and delays in compiling managerial reports. This research aims to develop an Inventory Information System Application to address these obstacles while enhancing operational efficiency. The software engineering methodology adopts the Waterfall approach through a structured lifecycle: requirements analysis, architectural design, program coding, functional testing, and system maintenance. This study successfully developed an integrated inventory platform that automates the recording of item movements (incoming / outgoing) and real-time stock updates. Testing and evaluation confirm that the system operates optimally, facilitates inventory tracking, and accelerates accurate data recapitulation. Overall, the implementation of this information system has proven effective in minimizing human error and optimizing inventory management at PT. Harta Jaya. Keywords: Inventory Information System; Inventory Management; Waterfall Method; Real-Time; PT. Harta Jaya. Abstrak Tata kelola persediaan barang secara konvensional pada PT. Harta Jaya memicu sejumlah permasalahan operasional, meliputi adanya perbedaan data stok, tingginya risiko rekam fisik hilang, serta hambatan waktu dalam perumusan laporan manajerial. Riset ini dimaksudkan untuk mengonstruksi Aplikasi Sistem Informasi Inventori Barang sebagai solusi atas hambatan tersebut sekaligus pengeskalasi efisiensi kerja. Metodologi rekayasa perangkat lunak yang diterapkan mengadopsi pendekatan Waterfall melalui siklus terstruktur: analisis kebutuhan, perancangan arsitektur, pengkodean program, pengujian fungsi, hingga pemeliharaan sistem. Penelitian ini berhasil mewujudkan platform inventaris terintegrasi yang mampu mengotomatisasi pencatatan mutasi barang (masuk / keluar) serta pembaruan stok secara real-time. Evaluasi pengujian mengonfirmasi bahwa sistem beroperasi secara optimal, mempermudah pelacakan inventaris, dan mengakselerasi rekapitulasi data yang presisi. Secara keseluruhan, pengimplementasian sistem informasi ini terbukti efektif menekan angka human error serta mengoptimalkan tata kelola persediaan pada PT. Harta Jaya.]]>
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