Be aware of the ambiguity of this role. Some companies call it UI/UX designer, or simply UI designer, while still requiring software-development knowledge in the job description.
What a UX engineer does
A UX engineer bridges design and development. They translate designs into real, working interfaces, build and maintain reusable component libraries and design tokens, prototype interactions in code, and make sure what ships matches the intended experience — and stays accessible and performant.
Skills a UX engineer needs
The role sits between two disciplines, so it draws on both: solid frontend skills (HTML, CSS, JavaScript and a modern framework), a working knowledge of design fundamentals and accessibility, and fluency with a design system. That combination is what lets a UX engineer keep design and engineering in sync.