I need a single developer who can craft a cohesive frontend experience for both a responsive website and companion iOS and Android apps. The visual direction is unmistakably modern—clean lines, intuitive navigation, and smooth micro-interactions that feel native on every screen size. Core functionality must include: • Secure user authentication (signup, login, social logins where feasible) • Seamless in-app purchases tied to our existing payment gateway Design files can be delivered in Figma or Sketch, and I’m happy to collaborate on component libraries or a design system if that speeds development. Code quality matters: reusable components, clear structure, and concise documentation will be part of the hand-off. If you prefer React + React Native, Flutter, or another robust stack, mention it; I’m flexible as long as performance and maintainability stay high. Final deliverables: • Fully responsive web frontend ready for deploy • iOS and Android builds (or a single cross-platform solution) compiled and tested • Source code with setup instructions Timeline and milestones are open for discussion once we review your proposed approach.