Hasan T.

I'm a senior mobile app developer with 8+ years of experience building and shipping iOS and cross-platform applications. My strongest background is in native iOS development with Swift, SwiftUI and UIKit, and I also build production apps with Flutter for clients who need both iOS and Android. Across my freelance career, I've worked with 150+ clients and received 500+ five-star reviews. On Upwork, I maintain a 100% Job Success Score. I can help with: • New iOS and Flutter app development • Taking over or completing unfinished apps • Rebuilding and modernizing existing applications • Swift, SwiftUI and UIKit development • Apple Watch and watchOS apps • Flutter apps for iOS and Android • Firebase, Supabase and Node.js integrations • REST APIs, authentication and push notifications • In-app purchases and subscription implementation • Bug fixing, performance improvements and feature development • TestFlight, App Store Connect and App Store submission My iOS experience includes Swift, SwiftUI, UIKit, Auto Layout, Combine, CoreData, StoreKit, CoreML, background services and Apple ecosystem integrations. For cross-platform projects, I work primarily with Flutter and Dart, with Firebase, Supabase or Node.js handling backend requirements when needed. I'm comfortable working on a product from the early planning stage through development, testing and release, but I also regularly work with existing codebases where a client needs a reliable developer to take over, fix problems or continue development. If you already have designs in Figma, an existing app that needs work, or just a clear product requirement, I can review what you have and help determine the best technical approach before development begins.