I will develop custom flutter apps with swift ios optimization

J
jokeratone
J
jokeratone
John
develop custom flutter apps with swift ios optimization
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develop custom flutter apps with swift ios optimization
Full Screen
Full Screen
develop custom flutter apps with swift ios optimizationdevelop custom flutter apps with swift ios optimizationdevelop custom flutter apps with swift ios optimization

About this gig

Is your mobile app suffering from slow performance, frequent crashes, or hardtomaintain legacy code? I specialize in refactoring and optimizing existing Flutter and native iOS (Swift / ObjectiveC) applications to bring them back to peak condition.

What I deliver:

  • Code restructuring reorganize messy or outdated code into MVVM or Clean Architecture, making it modular, testable, and scalable.
  • Performance tuning eliminate memory leaks, reduce app launch time, fix UI jank, optimize database queries and network requests, and improve battery efficiency.
  • Legacy migration safely rewrite old ObjectiveC or Swift codebases, or migrate hybrid apps to modern Flutter while preserving all business logic.
  • App Store compliance identify and fix hidden issues like Guideline 4.3 (spam), outdated privacy manifests, missing tracking disclosures, or deprecated SDKs that cause rejection.
  • Technical debt reduction simplify complex logic, remove dead code, enforce consistent naming and design patterns, and add comprehensive error handling.

Why choose me?

I follow industrybest practices with Git, CI/CD (Fastlane, GitHub Actions), and automated testing. You receive regular progress updates, TestFlight / APK tes

  • App type

    • Hybrid

  • Programming language

    • Dart
    • Objective-C
    • Swift

  • Frameworks

    • Flutter
    • SwiftUI

  • Purpose

    • Delivery
    • Music
    • Shopping
    • Taxi
    • Booking
    • Health & fitness
    • Maps & navigation
    • News
    • Custom
    • Wallet app

  • Tools

    • Android Studio
    • Xcode
    • Visual Studio Code

  • Expertise

    • Localization
    • Security
    • Design
    • Widgets
    • API integration
    • Compatibility

Get to know John

John

MobileFullStackDeveloper

  • FromChina
  • Member sinceAug 2026

  • Languages

    Chinese, English
Mobile Full-Stack Developer | Flutter & iOS Native (Swift/OC) & Backend Expert in cross‑platform Flutter, deep iOS optimization, and backend integration. Stack: Flutter/Dart, Swift/ObjC, Node.js/Python, Firebase, MySQL/MongoDB, MVVM, Clean Arch, CI/CD. Services: End‑to‑end app dev (UI to backend), native iOS bridges/plugins, App Store compliance & rejection fixes, legacy code migration (ObjC/Swift to Flutter). Commitment: clear milestones, regular test builds, clean documented code, full handover.

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