I already have a working prototype and now need a focused round of improvements before we move to public-ready release. The priorities are clear: • A full UI/UX refresh that goes beyond a simple polish. I want a design overhaul, cleaner navigation flows, and better accessibility throughout the screens so the app is friendlier for all users. • One key new feature—robust user authentication. It must handle sign-up, login, password reset, and secure token handling in line with current best practices. You will receive the current source, design files, and a brief explaining each screen’s function. I’m happy to walk you through the existing architecture on a quick call so you can gauge effort and suggest the best toolset or libraries for the changes. Acceptance criteria: • Updated interface matches agreed mock-ups pixel-perfect across target devices. • Navigation is intuitive; no dead ends or hidden actions remain. • Accessibility scores meet WCAG 2.1 AA for contrast, focus order, and screen-reader labels. • Authentication flow is fully functional, securely integrated with the existing back-end, and covered by basic automated tests. • Build passes and runs on the latest iOS and Android versions without new crashes or blocking warnings. If you have a strong eye for design, a solid grip on mobile security practices, and can iterate quickly while keeping code clean, I’d love to hear how you’d approach this next step.