Altaf ur R.

Senior Mobile App Developer with 14+ years of experience and 11,000+ Upwork hours, specializing in React Native, Flutter, iOS, Android and .NET MAUI. I help businesses build, fix, modernize and maintain production mobile applications. I’m especially experienced in taking over existing projects when the previous developer is unavailable, the codebase is outdated, builds are failing, or important features need to be fixed or completed. My core expertise includes: • React Native : production iOS & Android applications • Flutter : cross-platform mobile applications • Swift / SwiftUI : native iOS development • Kotlin / Java : native Android development • .NET MAUI / Xamarin : cross-platform .NET applications • Firebase, REST APIs and WebSockets • RevenueCat, Apple In-App Purchases & Google Play Billing • Stripe and payment integrations • Node.js / ASP.NET Core • AWS / Azure • OpenAI / AI integrations • App Store Connect & Google Play Console I can take ownership of the complete technical lifecycle of your application—from understanding an existing codebase and fixing production issues to implementing new features, integrating APIs, preparing builds, resolving App Store / Google Play issues, and providing long-term maintenance. Clients typically work with me when they need a senior developer who can work independently, investigate difficult problems, communicate clearly, and take responsibility for getting the application into a stable production-ready state. If you already have an existing mobile application that needs a reliable developer to take ownership of it, I’d be happy to review the project and help determine the best way forward.