The purpose of this work is to design and create a graphical user interface for a mobile application. The mobile application, which is an example of the implementation of the topic of the work, serves to reserve tables in catering establishments. The application is divided into three parts, one part that represents the caterer side, and the second part that represents the user side, and the authentication part that uses both previously mentioned sides of the application. The caterer has the option of adding one or more catering establishments, and the application user then has the option of reserving a table or more tables in those catering establishments. The caterer also has the option of accepting or rejecting the reservation, viewing the details of the reserved table, viewing the details of his or hers facilities, scanning the generated QR code that is generated when the reservation is confirmed for the purpose of verifying the authenticity of the reservation. The user has the additional option of searching for establishments by name, viewing the details of an individual establishment, viewing their reservations that are being processed and accepted reservations. Every application user has the option of creating an account for authentication or signing in to with an existing Google account. The technologies used in creating the application are React Native, JavaScript, Firebase authentication, NativeBase components, Redux and React Navigation are used to manipulate the application state. To retrieve data from the database, the Application Programming Interface (API) was used, which was created for the purpose of this application, and to fetch dana from API was used Axios