Toko Teh Yayah merupakan usaha ritel pakaian yang berkembang di Pasar Baru Kuningan sejak 2022. Meskipun telah memiliki omzet yang signifikan, pengelolaan transaksi dan promosi toko masih belum terstruktur secara digital, sehingga berdampak pada keterbatasan jangkauan pasar dan efektivitas operasional. Penelitian ini bertujuan untuk merancang dan membangun sistem e-commerce berbasis Business to Consumer (B2C) guna mendukung peningkatan penjualan dan efisiensi operasional toko. Pengembangan sistem dilakukan menggunakan metode Waterfall dengan tahapan analisis, perancangan, implementasi, pengujian, dan pemeliharaan. Teknologi yang digunakan meliputi PHP dan MySQL dengan dukungan 14 layanan e-commerce seperti pengelolaan produk, pesanan, pelanggan, promosi, dan laporan penjualan. Sistem ini dirancang agar pelanggan dapat melakukan pembelian secara praktis, cepat, dan informatif, sementara pemilik toko dapat memantau kinerja penjualan secara real-time. Hasil dari implementasi sistem menunjukkan peningkatan pada efektivitas proses bisnis serta perluasan jangkauan pasar. Dengan demikian, platform e-commerce ini menjadi solusi strategis bagi Toko Teh Yayah dalam menghadapi tantangan di era digital dan meningkatkan daya saing bisnisnya.

The development of information technology and the internet has driven digital transformation across various sectors. E-commerce has emerged as a modern strategy in commerce, including within the small and medium-sized enterprise (SME) sector. This study aims to design and develop an e-commerce system based on the Business to Consumer (B2C) model to support operational efficiency at Toko Teh Yayah, a clothing store located in Pasar Baru, Kuningan. The main issues faced by the store include transaction records that are still done manually, limited market reach, and suboptimal promotion and branding strategies. This research employs the Waterfall software development methodology, which consists of the stages of requirements analysis, system design, implementation, testing, and maintenance. Data collection techniques used include interviews, observation, questionnaires, and literature review. The system was developed using the PHP programming language and MySQL as database, and it features 14 key components such as product, order, customer, promotion, and sales report management, as well as personalized notifications and a loyalty program. The implementation results show that the system helps the store manage sales in a more systematic way, expand market reach through an online platform, and enhance the store’s image and digital marketing strategy through an interface that reflects the brand’s identity.