The 8telecom Business center which is the focus of this endeavor is a telecommunications and gadgets provider and smart load products located at Davao City, Philippines. The company is experiencing difficulties in rendering quality service to their customers due to insufficient number of service crews who could not cater extensively to the demands of the customers and due to limited shop space. To address these concerns, the proponents aimed to develop a system that would help the organization to accommodate their customers and to provide convenience upon buying their products, as well as to speed up the process of retrieving and updating the sales and inventory records. The Web Engineering process model was used because this process model was designed for the development of web-based systems. After a series of testing, the proponents concluded that the development of online sales management and inventory system enabled the business to accommodate the customers through the World Wide Web, speed up monitoring of the sales and inventory record and eliminate high costs on labor and operating expenses of the hosting PayPal, online catalog, and automated generation of sales summary.