๐ I've shipped real iOS & macOS apps โ HealthKit integrations, AI-powered tools, and App Store-ready products built with Swift, SwiftUI, and Objective-C. If you need a Senior iOS & macOS Developer who has already solved the problems your project will face, keep reading.
What I've Built
Over the past few years, I've developed and shipped iOS & macOS apps across health & fitness, AI tools, and on-demand services โ using Apple Xcode, iOS SDK, SwiftUI, and native Swift:
A health insights app with Apple HealthKit, wearable data, and AI (Klarity)
An AI Logo Maker with real-time design generation and dynamic templates
A Thumbnail Maker with Firebase, AWS S3, and OpenAI API integration
A walking & fitness app with step tracking and goal-based programs
A car rental platform with booking workflows and secure authentication
These weren't side projects. They were production apps built for real users and shipped through the App Store.
What I Build For You
โ Full iOS & macOS app development โ Swift, SwiftUI, UIKit, Objective-C
โ iOS SDK, HealthKit, Firebase, REST API, and OpenAI integration
โ Apple Xcode-based clean architecture built to scale, not just to ship
โ App Store submission, approval support, and TestFlight setup
โ Bug fixing, legacy Objective-C migration, and performance optimization
How I Work
I start by understanding your goal, not just your feature list. Then I build with clean architecture using SwiftUI or UIKit โ whichever fits your product best โ test thoroughly, and stay with you through App Store launch. You won't need to chase me for updates. I communicate clearly, flag problems early, and treat deadlines seriously.
Who I Work Best With
Founders and small teams who have a real product idea and need a Senior iOS & macOS Developer who can own the Apple ecosystem end-to-end โ iPhone, iPad, and Mac โ without hand-holding.
๐ฉ Send me a message with what you're building. I'll tell you honestly if I can help, which stack fits best, and how long it will take.
Mike M.
Senior Mobile App Developer | iOS, Android & Flutter | 13+ Years
Newcastle-under-Lyme, United Kingdom
$60/hr$60 per hour5.0 (3) 5 jobs $6K+ total earnings
Iโm a senior mobile developer with 13+ years of experience building and maintaining production apps across iOS, Android and Flutter.
I help businesses take ideas from concept to scalable, production-ready products or improve existing apps that need a more solid foundation.
Most of my work falls into:
- Building new apps from scratch
- Turning MVPs into scalable, maintainable products
- Refactoring and stabilising existing apps
- Taking ownership of existing mobile projects
I can work across the full development lifecycle, from architecture and technical decisions through to development, testing and App Store / Google Play delivery.
Tech:
- iOS: Swift / SwiftUI
- Android: Kotlin / Jetpack Compose
- Flutter: Dart
Whether you need a new app built properly from day one or an experienced developer to take an existing product forward, feel free to get in touch.
Oleg R.
Flutter Mobile App Development | Android iOS | AI Mobile App Developer
London, United Kingdom
$40/hr$40 per hour4.8 (44) 82 jobs $300K+ total earnings
Full stack mobile app developer with 15+ years of experience in Mobile App Development, specializing in Flutter, React Native, React, IOS, Swift, Android, Python, and Java.
I have successfully delivered 120+ mobile applications in different roles as flutter app developer, flutter full stack developer, flutter flow, ai mobile app developer, mobile app design, mobile ui ux designer, ios developer, android developer, react native developer, mobile game developer achieving a 5-star rating on Upwork and helping clients scale their businesses with high-performance solutions.
๐ Flutter Mobile App Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer for Mobile app development project.
Expert in Flutter mobile app development, delivering 30+ high-performance apps with pixel-perfect UI and smooth animations. Skilled in clean architecture and comprehensive testing for robust solutions. Experienced Mobile App Developer.
๐น Applied game mechanics for engaging experiences in mobile development where I was a Mobile Game Developer.
๐น Integrated real-time features, secure authentication, and cloud functions as Flutter Firebase Developer.
๐น Built seamless API integrations and data synchronization in mobile development in Flutter mobile app development as a Flutter Laravel Specialist.
๐ iOS app developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development:
Developed and optimized 40+ iOS apps using Swift. Implemented complex features as iOS app developer, maintaining clean architecture and best practices. Leveraged extensive experience as iOS developer Swift to create intuitive user experiences and solve challenging technical problems. Collaborated with cross-functional teams as Swift iOS developer, utilizing Kotlin Swift expertise to deliver high-quality applications on time and exceed client expectations on iOS Swift smartphone platforms.
๐ Android Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development:
Built 30+ Android apps with adaptive UI, material design, and battery-friendly performance. Expert in Android Kotlin developer, leveraging Kotlin Swift and Kotlin Multiplatform for cross-platform solutions. Optimized security as Android reverse engineer and streamlined releases as Android app publisher, enhancing engagement and update efficiency.
๐React Native Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development:
Built 20+ cross-platform apps with responsive UI and seamless sync. Expert in React Native mobile, React Native Expo, and React Native Firebase for real-time features. Optimized communication with React Native WebRTC. Crafted interactive experiences as React JS and Front End React specialist. Developed hybrid solutions as Java React expert, maximizing code reuse.
๐ฑ Performance & Scalability: Built apps supporting 1M+ users, integrating real-time updates, gamification, and video streaming.
๐ฐ Business Impact: Helped startups and enterprises generate $10M+ in revenue through well-optimized and engaging mobile applications.
iOS App Development Case Study ๐ฑ
Developed a high-performance iOS app using iOS Swift that achieved 5 star rating and featured status in the App Store. Implemented Flutter iOS compatibility for future cross-platform expansion while maintaining native performance and security. Supported iOS app marketing efforts with analytics implementation and App Store optimization, resulting in 35% higher user retention than industry average.
I am currently not accepting WordPress projects as I'm focusing exclusively on mobile app development.
Professional Achievements
๐ Rewarded as ๐ ๐ง๐ข๐ฃ ๐ฅ๐๐ง๐๐ ๐ฃ๐๐จ๐ฆ ๐
๐ 4154 mobile app development hours on Upwork and still counting
๐ 100% Job Success in mobile app development (Client Satisfaction Ratio)
๐ 54+ mobile app development jobs completed successfully
โ 98% of Clients Recommended working with me as with AI Mobile App Developer
โ 80% Long-term Repeat Clients
โ 15+ Years Of Experience in mobile app development, 6 years experience in Flutter mobile app development, 7 years experience in Swift and Kotlin, 4 years experience in React Native.
โ High-Quality Work
โ Cost-Effective AI Mobile App Developer
โ Fluent English Verified
โ 93% on-time delivery rate across all mobile app development milestones
Got an app idea that you think is ready to make a splash? Let's dive in and explore it together in a free intro call
Need a mobile app that is fast, stable, easy to use, and ready for real users on iOS and Android?
Iโm a Mobile App Developer specializing in Flutter, React Native, iOS development, Android development, Swift, Java, Kotlin, APIs, Firebase, and scalable mobile application development.
I build mobile apps for startups, SaaS companies, ecommerce businesses, marketplaces, healthcare platforms, booking systems, fintech products, and growing businesses. Whether you need a new mobile app, an MVP, an existing app improved, or a web platform converted into a mobile experience, I can handle the development from architecture through App Store and Google Play deployment.
Mobile App Development
I build complete iOS and Android applications with a strong focus on performance, maintainable code, responsive interfaces, API integrations, and reliable production releases.
โ Mobile App Development
โ iOS App Development
โ Android App Development
โ Cross-Platform App Development
โ Mobile MVP Development
โ SaaS Mobile Applications
โ Business Mobile Apps
โ Existing App Improvements
โ App Bug Fixing
โ App Performance Optimization
โ App Store Deployment
โ Google Play Deployment
Flutter App Development
I develop cross-platform mobile applications using Flutter and Dart for businesses that need a consistent iOS and Android experience from one maintainable codebase.
โ Flutter Development
โ Dart Development
โ Flutter iOS & Android Apps
โ Flutter Firebase Integration
โ Flutter API Integration
โ Flutter UI Development
โ Flutter App Redesign
โ Flutter Bug Fixing
โ Flutter Performance Optimization
โ Existing Flutter App Development
React Native Development
I build and improve React Native applications using JavaScript and TypeScript for startups, SaaS products, ecommerce platforms, and API-driven mobile applications.
โ React Native Development
โ React Native iOS Apps
โ React Native Android Apps
โ JavaScript & TypeScript
โ REST API Integration
โ Firebase Integration
โ Authentication
โ Push Notifications
โ Payment Integrations
โ Existing React Native App Improvements
Native iOS & Android Development
For projects that require native functionality, I work with Swift for iOS and Java/Kotlin for Android development.
โ Swift Development
โ Native iOS Development
โ Java Android Development
โ Kotlin Development
โ Native Android Development
โ iOS & Android SDK Integration
โ Device Features & Permissions
โ Camera, Location & Maps
โ Push Notifications
โ In-App Purchases
โ App Store & Play Store Releases
Backend, APIs & Mobile Integrations
I connect mobile applications with reliable backend services, databases, payment platforms, authentication systems, and third-party APIs.
โ REST API Integration
โ Firebase
โ Supabase
โ Node.js APIs
โ Authentication & User Management
โ Stripe & Payment Integration
โ Google Maps Integration
โ Social Login
โ Push Notifications
โ Real-Time Data
โ Third-Party SDK Integration
โ Analytics & Crash Reporting
Core Technologies
Mobile: Flutter, Dart, React Native, Swift, Java, Kotlin
Frontend: JavaScript, TypeScript, React
Backend & APIs: Node.js, REST APIs, Firebase, Supabase
Databases: Firebase Firestore, PostgreSQL, MySQL, MongoDB
Integrations: Stripe, Google Maps, Apple Sign In, Google Sign In, Push Notifications
Tools & Deployment: Git, GitHub, Xcode, Android Studio, App Store Connect, Google Play Console
Why Clients Hire Me
โ Flutter & React Native Development
โ Native iOS & Android Development
โ Swift, Java & Kotlin Experience
โ Cross-Platform Mobile App Development
โ API & Firebase Integration
โ Existing Mobile App Improvements
โ Mobile App Bug Fixing & Optimization
โ App Store & Google Play Deployment
โ Clean and Maintainable Development
โ Clear Communication & Reliable Delivery
โ Full Ownership From Development to Launch
I focus on building mobile applications that are reliable, scalable, responsive, and ready for real users rather than apps that only work well in a demo.
Whether you need a Mobile App Developer, Flutter Developer, React Native Developer, iOS Developer, Android Developer, Swift Developer, or Java Developer, send me your requirements, existing application, or design files.
Iโll review what you need and recommend the most practical development approach.
SEO Keywords: Mobile App Developer, Flutter Developer, React Native Developer, iOS Developer, Android Developer, Mobile Application Developer, Flutter App Developer, React Native App Developer, Swift Developer, Java Developer, Kotlin Developer, iOS App Development, Android App Development, Cross Platform App Developer, Mobile App Development, Flutter Development, React Native Development, Firebase Developer, Dart Developer, Mobile MVP Developer, App Developer, App Store Deployment, Google Play Deployment, REST API Integration, Firebase Integration
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