The subject of this master’s thesis is a mobile Android application for the sale of laptops and computers. The idea as well as the realization of this multifunctional application are based on the potential of using appropriate technologies as well as their implementation. Mentioned functionalities refer to countless options for the user, such as viewing available devices, searching for them by name, filtering by category, adding products to the Favorites section, then adding products to the cart and purchasing selected products, etc. There are two types of users in the application: regular users, known as "client" and users with administrative rights, known as "administrators". Categorization enables the multidimensionality of applications as well as increasing the level of data security. After the successful installation process of the application on the mobile device, the user is offered the option of creating an account or logging in if he has a previously created account. When creating the application, the MVVM (Model-View-ViewModel) architecture is used. The application is made for Android devices and written in the Kotlin programming language. Data is stored in 2 places: Firebase and Room. The code is written in the integrated development environment (IDE) Android Studio.