I am looking for an experienced developer to build a cross-platform demo application (Windows + Android) with a very beautiful, modern, and premium fintech-style UI design. The application must look highly professional, visually attractive, and advanced with smooth animations and a clean layout. Before the main application opens, there should be an admin input option where I can manually enter the username and account balance, and that same information should be displayed inside the software interface. Additionally, before entering the main app, there should be a Yes/No toggle option to control withdrawal behavior in demo mode: if “Yes” is selected, any demo withdrawal (e.g., crypto/Bitcoin source) should show a successful transaction after the loading animation; if “No” is selected, clicking the withdrawal button should directly redirect the user to the subscription plan page and prompt them to purchase a plan. The app should include a login screen (UI only), a dashboard showing user balance (based on the manually entered demo data), a withdrawal screen where users can enter an amount and select a payment method, followed by a loading animation and system-controlled response as described above. After redirection, the subscription page should display three plans, and upon selecting a plan, a popup should show a crypto payment address (UI only, no real payment integration required). No backend, no database, and no real transaction processing is needed — this is purely a front-end demo/prototype. The project must be completed within 7 days. Clean code and high-quality UI/UX are required.