As a UI/UX designer, my number one focus is the usability of the product. My process always begins with research through mobile/web applications and also drawing inspiration from daily life. Once the ideas start coming, I start creating wireframes for how the layout should look. In this step it is also important to consider the flow and transitions of the product. Sometimes Flash mockups or animations are needed to demonstrate these thoughts.
Once the wireframes are more-or-less finalized, I can begin concepting the visual aspect of the UI. I always believe in having multiple options and narrowing down the choices from there. To me, being a great UI designer also means working closely with other teams. With the guidance of a product manager, the technical knowledge of an engineer, and the artistic style of an artist, we have the privilege of working on a project from start to finish.