In designing mobile apps, I start with thorough user research to understand the target audience and their needs. This research guides the creation of detailed wireframes, outlining the app's structural layout and functionality. Next, I develop interactive prototypes to validate the user flow and gather feedback for iterative improvements. I then craft high-fidelity mockups to present a visually polished version of the app, including design elements, color schemes, and typography. Finally, I deliver a comprehensive design specification document and style guide to ensure developers can implement the design with precision and consistency.