The main purpose of this thesis was to detail the development process of a Customer Relationship Management (CRM) application prototype as a solution to address the specific administrative needs of a small company. The objective was to provide a customized solution for efficiently managing tasks related to the company's sales processes. The application was implemented using Laravel and React as its main technologies, and the development process involved the design and implementation of both the front-end and back-end components, resulting in a functional prototype of a full-stack application. This thesis documents the technical details of the development process, as well as the results of the testing and evaluation of the final prototype.