Perkembangan teknologi mendorong pelaku usaha untuk beralih ke sistem digital melalui e-commerce. Kedai Pramuka Tunas Harapan masih menjalankan proses bisnis secara manual, yang menyebabkan keterbatasan jangkauan pemasaran, potensi kesalahan pencatatan, dan keterlambatan pembuatan laporan. Untuk mengatasi permasalahan tersebut, dikembangkan aplikasi e-commerce berbasis web dengan model Business to Consumer (B2C) menggunakan metode Waterfall. Sistem menyediakan fitur manajemen produk, keranjang belanja, pembayaran, dan laporan transaksi. Hasil pengujian black box menunjukkan seluruh fungsi berjalan dengan baik. Sementara itu, pengujian UAT memperoleh skor 34 dari 40 dengan persentase kelayakan 85% dan rata-rata skor 4,25, yang termasuk kategori “Sangat Baik”. Hasil tersebut menunjukkan bahwa aplikasi mampu memenuhi kebutuhan pengguna serta meningkatkan efektivitas proses penjualan dan pengelolaan data.
Technological developments are encouraging businesses to shift to digital systems through e-commerce. Kedai Pramuka Tunas Harapan still operates its business processes manually, resulting in limited marketing reach, potential recording errors, and delays in reporting. To address these issues, a web-based e-commerce application was developed with a Business to Consumer (B2C) model using the Waterfall method. The system provides product management, shopping cart, payment, and transaction reporting features. Black box testing results showed all functions running well. Meanwhile, UAT testing obtained a score of 34 out of 40 with a feasibility percentage of 85% and an average score of 4.25, which is categorized as "Very Good." These results indicate that the application is able to meet user needs and improve the effectiveness of the sales process and data management.