This document discusses the UI/UX design of hotel search and booking applications using the Lean Experience method. It begins with an introduction and background on the topic. It then discusses studying the relevant literature on UI, UX, and the Lean Experience method. The research methodology section outlines the steps of the Lean Experience method, including declaring assumptions, creating a Minimum Viable Product, and running user experiences and feedback. Wireframes and prototypes of the sample hotel application are included to demonstrate the design process. The document concludes that the researcher gained knowledge on how to design a UI/UX for a hotel booking application using this method.