Aplicación Móvil y de Escritorio POS Offline para la Empresa Full Colombia S.A.S.

Abstract

This work presents the results of an internship at Full Colombia S.A.S., a company based in Tunja that develops Full Suit, a point-of-sale and electronic invoicing solution. The work focused on the system's local application, built with Flutter, which operates offline on a SQLite database and synchronizes its data with the backend services once the network is restored. The desktop application was refactored, including a redesigned interface, fixes to pagination errors and form validation, and a new cashier shift module with an end-of-shift receipt and versioning of the local database schema. An Android version was developed, with two point-of-sale modules designed for small screens. A dynamic pricing system was implemented that lets the cashier set the final price and derives the taxable base, the discount and the tax through an inverse formula, coordinated with the web platform so that both applications produce the same value and the electronic invoice is accepted by the DIAN. Finally, the work was integrated into the team's SCRUM workflow, and synchronization was redesigned as independent steps that tolerate partial failures, together with exportable diagnostic logs. All four objectives were met, and the features are in operation at the businesses that use the system.