To become a UX engineer, you need a mix of technical, design, and soft skills. On the technical side, you need to know how to code the front-end of a web or mobile app using HTML, CSS, JavaScript, and frameworks like React or Angular. You also need to be familiar with web standards, accessibility, responsiveness, and performance optimization. On the design side, you need to know how to apply UX principles, methods, and tools to create user-centric solutions. You need to be able to conduct user research, create user personas, user journeys, wireframes, mockups, and prototypes. You also need to be able to test and evaluate your designs using user feedback, analytics, and usability testing. On the soft side, you need to have good communication, collaboration, and problem-solving skills. You need to be able to work in a team, understand the business goals and constraints, and present and justify your work and decisions.