 The paper discusses the importance of user interface, UI, and user experience, UX, design and creating effective educational platforms. It examines existing recommendations on UI slash UX design, as well as research papers that study user interface usability and evaluate user experience in designing online platforms. Additionally, it identifies modern trends and web design of educational platforms and provides a description of an online course model based on analysis of the requirements for existing and functioning educational online systems. The paper concludes that the design of educational online courses should meet certain criteria, including easy-to-perceive content, no extra information, easy and simple navigation on the pages of the course, and following the principles of usability. This article was authored by Katarina V. Vlasenko, Irina V. Lovinova, Sergey V. Volkov and others.