Traditional cash registers are bulky and disconnected. This project involved designing a unified ecosystem for small to medium-sized businesses (SMBs). The solution consists of a Web Dashboard for deep administrative work and a Mobile Android POS app that transforms a standard smartphone into a powerful fiscal tool and business assistant. Business owners often struggle with fragmented systems: one for payments, another for inventory, and a third for booking. The goal was to consolidate these into a single, intuitive UI that feels consistent whether the user is on a desktop in the back office or holding a smartphone at a checkout counter.