There is an increasing requirement for digital transformation of the working environment and business due to the rapid growth and development of digital technology over the past ten years. As a result, digital devices now play a crucial role in the transmission of information, especially smartphones, which are increasingly a part of daily life due to their portability and versatility. The mobile applications with the most appealing designs and understanding of their users' needs stand out in a market that is oversaturated with the former. This final paper's central topic outlines the standards for developing the user interface and user experience for the Student Service in Varaždin mobile application. As of the time of writing this paper, such an application for students in northern Croatia does not presently exist on the market and is only available as a website of Student Centre in Varaždin. The prototype application illustrates how one such system of services for students would operate through a mobile application. This paper consists of a theoretical part, which discusses the importance of UI/UX design and the key elements when creating mobile application prototypes, and a practical part, which presents the design and structure of the application developed in the Figma UI/UX tool. Also, as a part of the practical work, a survey was conducted with the goal of optimizing the user experience.