UI and UX are one of the important elements in a digital application. Implementing a good UI and UX can help and simplify the process of interaction between applications and users which then leads to a positive user experience. However, if an application is not implemented using a good UI and UX, the opposite will happen, namely the inhibition of the information interaction process between the application and the user, which in turn creates frustration on the user's side. Currently, UI and UX are applied in every type of application development, one of which is an e-commerce type application. Good UI and UX implementation in e-commerce applications is expected to add value to the user experience that can compete with other similar e-commerce applications to get consumer attention or engagement. This study aims to see how big the role or impact of UI and UX in influencing consumer interest in e-commerce applications. In this case, the research object of the e-commerce application used is Shopee. This type of research is quantitative research methods conducted through a questionnaire as a source of research data. The questionnaire was randomly assigned to 30 people who met the criteria, among others, aged between 15 to 25 years, using existing e-commerce applications for more than 3 months, and using e-commerce applications for at least the past month. The result is to redesign a high-fidelity prototype from Shopee that is in accordance with the UI and UX rules and principles from the results of research data sources. The results of the Shopee redesign will then be carried out a second data collection as a form of validation. The result is that as many as 63 percent of respondents said that the display of the redesign is better than the current version of the Shopee application. It can be concluded that applying good UI and UX principles in e-commerce applications can increase consumer interest in using these applications.