UX designers Design products that are intuitive and easy to use. They create a customer experience that will inspire loyalty and satisfaction. UX Designers may be tasked with creating mock-ups, prototypes and user-testing studies all designed to gather feedback from the client. Understanding of HTML, CSS and other style languages can be an asset. They then collaborate with the product and engineering teams to create flows, wireframes, storyboards and prototypes in order to ensure a high-quality end product and experience.