Mazen E.

Give me an app idea, an unfinished product, or a broken mobile feature, and I'll build or fix it so it works reliably for your users. That's my promise. I build, fix, test, and ship production-ready iOS and Android apps for startups, businesses, and development teams. 27 completed projects on Upwork, 100% Job Success, Top Rated. WHAT I DO • Build complete apps from Figma designs, native iOS (Swift/SwiftUI) or cross-platform (Flutter/React Native) • Fix and stabilize existing codebases: crashes, bugs, performance issues, outdated dependencies • Integrate third-party SDKs, Firebase, REST APIs, in-app purchases, and subscriptions • Test apps and SDKs thoroughly before release • Publish to the App Store and Google Play, including resolving App Store rejections WHY CLIENTS WORK WITH ME • One developer for development, backend integration, testing, and release, no hand-offs, no gaps • I treat your app like my own product: user experience, maintainability, performance, and post-launch stability, not just code that compiles • Clear communication, fast responses, and dependable delivery on the agreed timeline • 3+ years of professional mobile development in iOS and Flutter roles at software agencies and product studios, alongside freelance work • Native Arabic speaker with fluent English, RTL layouts, Arabic localization, and smooth communication for MENA and Gulf clients TECH STACK iOS: Swift, SwiftUI, Xcode | Cross-platform: Flutter, Dart, React Native | Backend & services: Firebase, REST APIs, in-app purchases & subscriptions | Release: App Store Connect, Google Play Console, TestFlight HOW WE START Send me an invitation or a message with your requirements. I'll reply with how I can help, what needs to be done, and the clearest next steps.