The goal of this project was to develop a multiplatform mobile application in Xamarin that will allow employees to sign up and sign out of work using NFC technology. The application enables quick and easy login to the job, and requires ID and password entry. The theoretical part of the paper includes a description of the three most widely used mobile platforms in Android, iOS and Windows Universal Platform, and the development environment for multiplatform mobile applications, most important of which are Xamarin. Further, it contains a description of the C # programming language in which there is a written logical part of the application and a XAML language with a written graphical interface. The application consists of two main screens. A home screen that requires a user ID and password entry, and the other screen allows you to scan an NFC chip. The application itself verifies whether employee is made to work or to leave a job using a database.