I want to hire a freelancer or small team to build a full, production-ready mobile application similar to Endel. This is not an MVP. I want a polished, premium-quality app with excellent UI/UX, smooth animations, and a scalable architecture that can support future features and growth. The app should generate and play adaptive soundscapes for focus, relaxation, sleep, and mood. It must feel modern, minimal, and premium. Core features include onboarding and personalization (user goals, sound preferences, optional account login), loop-based generative audio with layered sounds, smooth transitions, background and offline playback, timers, fade in and out, sleep mode, favorites, and recent sessions. The app should offer preset modes such as Focus, Sleep, Relax, Work, and Power Nap, with adjustable intensity and time-based suggestions. A content system is required so sound packs, categories, images, and text can be updated remotely. The UI/UX must be clean and high-end, with a beautiful player screen, smooth micro-interactions, good typography, and proper spacing. Monetization should include free and premium access, in-app subscriptions (monthly and yearly), restore purchases, and a paywall screen. Basic analytics and crash reporting should be included. The backend must be scalable and well-structured, supporting user profiles, preferences, content management, subscriptions, and secure authentication, with clear API documentation. You may use Flutter or React Native for the app and Node.js or Laravel for the backend, but the solution must be production-grade and cloud-ready. Deliverables include full source code, UI/UX design files (Figma), backend API documentation, deployment instructions, and app-store-ready builds. My budget is around $500. If this is not realistic for a full Endel-level app, explain clearly and propose a phased delivery plan or adjusted scope while maintaining quality. When applying, please share relevant past work, your approach to generative or loop-based audio, your UI/UX process, and a realistic delivery plan.