I’m building a single code-base application in C# (.NET 7/8) with .NET MAUI that must ship simultaneously on iOS, Android, and Windows. The core scope is clear: email-and-password sign-up / sign-in, real-time push notifications, and fully native in-app purchases on each store. Authentication should follow best practices—salted hashing, secure token handling, and a smooth forgot-password flow. Push notifications need to route through FCM for Android, APNs for iOS, and the Windows notification service, with badge and alert support. For in-app purchases I need product retrieval, purchase flow, receipt validation, and graceful fallback when a purchase is interrupted. I’m expecting a clean MVVM architecture, dependency injection, and platform-specific services abstracted behind interfaces so future features drop in easily. Shared UI must respect native guidelines yet keep a consistent brand feel. Deliverables • MAUI solution with well-commented source • Build-ready projects for iOS, Android (AAB), and Windows (.msix) • Brief setup & deployment guide • Test credentials and demo products so I can verify auth, notifications, and purchase flows end-to-end I’ll run code review and functional tests on each platform before final sign-off. If this fits your expertise, I’m ready to move quickly.