I build and ship AI-powered iOS apps 3x faster(Bug fixes in 24 to 48 hours, Prototype in 3 to 7 days, MVP in 1 to 2 weeks) than traditional developers. As the founder of a mobile studio that has shipped 8 iOS apps in just 9 months, I understand that code is useless if it doesn't launch. I specialize in taking raw ideas and turning them into fully functional, App Store-approved products in weeks, not months. What I Bring to Your Project: • Speed & Efficiency: My 3 years+ experience allows me to prototype rapidly and iterate instantly. i • Full-Stack AI Integration: Expert in integrating OpenAI, Claude, and Gemini APIs into intuitive SwiftUI interfaces. • Product Mindset: I don't just code; I handle the full lifecycle from UI/UX design to App Store submission and rejection handling. My Recent Launches: • ToneFit AI: A workout tracker with AI-generated routines (Dec 2025). • NetCal: An AI-powered calorie tracker (May 2025). • UpRight: A posture coach utilizing AirPods motion data (July 2025). Whether you need an MVP to test a market or a complex AI integration, I deliver production-ready code that scales.

Currently I provide software development services of photo and video editing applications for iOS, iPadOS, macOS and visionOS. I offer the development of video and photo editing application from scratch or upgrading the existing app. For my solutions I use Swift and Objective-C programming language. The typical tasks which any video editing app consists are: – Video recording – Video stabilisation when recording – The screen capture at desired FPS – Video editing – Video generation (without source video file) – High FPS, 4K and HDR video edit and recording – Frame-by-frame video pipeline processing – Speech to text recognition – Video captioning and subtitles Functions that could be added to the new app or existing app – Reverse video – Crop & resize – Aspect ratio change – Change quality – Trim the video – Subtitles and captions – Stickers over video – Add watermark – Filter effects – Images to video – Audio overlay Let me know whether you have any questions about my solutions, tasks and functions that we could add into your app. Find and download the following apps in the AppStore as a demonstration of proof of experience: – Scrolling Credits Video – SubtitlerKit – Split Video Into Parts – Video Grid Collage _ Besides of video editing software experience, I have the experience in the development, support and maintenance of iOS software that is used by millions of people. I saw all the way how the project grows and turns from a startup to a big company. I understand the problems of both a small startup and a large company. My main services are: – The development of video recording and video editing applications for Apple devices – iOS, macOS, iPadOS and visionOS application development based on SwiftUI and Combine – The support of legacy applications and projects that were done in Objective-C programming language What will you get – Analysis of your problem and task – Working proof of concept in a week or a month depending on the complexity – Constant and clear communication on work and issues During all the time I had experience with: – Developing of iOS, Mac and MacCatalyst applications – C, C++, Objective-C, Swift – CoreData, SQLite, SQL – GCD, Mulththreading – Core Audio, AudioUnits, AVFoundation, AVKit, AVAudioEngine – AudioKit – GPUImage, Metal, MPS, CoreImage – CallKit, CoreTelephony – CoreText – SwiftUI, Combine – MapKit, MapBox, GoogleMaps – iOS Extensions – Debugging – CocoaPods, Carthage, SPM – JIRA, Trello, Slack, Figma – Scrum, Kanban, Agile – GIT, GitHub, BitBucket – MVVM, MVC – Data structures & Algorithms – Firebase, Testflight – Twilio SDK

⭐ Specialized in Mobile App Development | Flutter, Kotlin & Swift | iOS and Android ⭐ 6+ Years of Advanced Programming Experience ⭐ Expert in Crafting High-Performance Mobile Applications Featured Projects and Achievements: 🔵 'Ihre Apotheken' App Transformation Led the transformation of the Ihre Apotheken app into a robust digital health platform for German pharmacies, achieving 100k+ downloads and a 4.5 App Store rating. Technologies: Flutter, Dart, Firebase, Riverpod 🔵 Revlum Offerwall SDK Development Developed Android and iOS SDKs for Revlum, enabling seamless configuration and launch of an offerwall WebView for user rewards. The Android SDK was built with Jetpack Compose, Koin, Retrofit, and DataStore, deployed as a binary to AWS S3. The iOS SDK used SwiftUI, UIKit, async/await, and URLSession, published as an XCFramework to GitHub releases. Created Flutter and React Native plugins published on pub.dev and npm. 🔵 MAF iOS SDK Redevelopment Fixed a non-functional iOS SDK for MAF, built with UIKit and WebView (WebKit), distributed as an XCFramework via SPM to GitHub releases. Improved integration documentation. 🟠 Car Rental Application Enhancements Enhanced a car rental app, integrating deep linking with uni links and the Smartcar API for contactless lock/unlock functionality. Fixed bugs and refined the codebase. 🟠 PiP App Overhaul Converted the PiP app from Android to Flutter, improving task scheduling and data management. Migrated from Room to Isar for NoSQL performance. Technologies: Flutter, Isar, Firebase, Sentry 🟠 Aplauz Digital Wallet Enhanced UX with biometric authentication and automated localization. Built with Flutter and Riverpod for robust architecture. Technologies: Flutter, Python, Riverpod 🔵 ChatGPTool Developed a Flutter-based app integrating OpenAI's ChatGPT and Whisper APIs for streamlined company communication. Used Firebase for backend services like authentication, cloud storage, and serverless functions. Technologies: Flutter, Firebase, OpenAI APIs ⚫ myKiK POS & Loyalty App Led the development of the myKiK app for KiK Textile & Non Food B.V., building a retail and loyalty platform with Flutter Bloc, Retrofit, and CI/CD via Jenkins. Technologies: Flutter, Bloc, Retrofit, Jenkins 🔵 FootFact Developed a machine-learning-driven app for precise foot measurements, integrating offline-first functionality with Dio, Floor database, and Firebase Authentication. Technologies: Flutter, Firebase, Dio, Floor Database 🟠 Spective Connect IoT Developed an IoT solution addressing WiFi disconnection issues and adding service reporting features using MQTT Protocol and Jetpack components like Room. Technologies: Kotlin, MQTT Protocol, Firebase Analytics 👨‍🏫 Lecturer at Algebra University College, Zagreb Led a 6-month, 230+ hour Android development course, covering Kotlin, Android SDK, Room, Coroutines, Retrofit, MVVM, and clean architecture principles. 🎓 MSc in Computer Engineering Proud graduate of Josip Juraj Strossmayer University, Croatia. 🌟 Why Choose Me? Client-Centric Solutions: I meet project requirements while exceeding expectations. Innovative Problem Solver: I deliver impactful, scalable solutions. Reliable & Communicative: I ensure seamless workflows and client satisfaction. 😁 Ready to elevate your mobile application? Let’s connect and discuss your project needs!

👋 Need a high-quality iOS app? Let’s build it together! Top 1% UpWork Freelancer I’m a Senior iOS Developer with 14+ years of experience and 85+ completed projects, delivering top-tier iOS apps with Swift, SwiftUI, and Objective-C. I specialize in social networks, financial apps, AI-driven solutions, and location-based services. 🚀 What I can do for you: ✅ Full-cycle iOS app development – from concept to App Store launch. ✅ Seamless API integration – REST, WebSockets, Firebase, AWS. ✅ Pixel-perfect UI implementation – Figma, Sketch, Adobe XD. ✅ AI-powered apps – OpenAI, GPT-based solutions. ✅ Geolocation & Maps – Google Maps, Mapbox, Apple Maps. ✅ In-app purchases & subscriptions – with server-side validation. ✅ Server-side development – using Swift & Firebase for lightweight backend solutions. ⚙️ Tech Stack: Swift, SwiftUI, Objective-C, Firebase, AWS, REST APIs. 📈 Why me? ✔️ 85+ completed projects – from MVPs to enterprise apps. ✔️ Clean, maintainable code with Apple’s best practices. ✔️ Strong problem-solving skills and focus on performance optimization. 💬 Let’s talk! I’m here to turn your vision into a high-quality app.

Founder, full-stack & AI engineer with 12 apps live on the App Store, 4,000+ users, and a Top Rated profile with 100% Job Success. I'm not just a developer for hire. I build, ship, and operate my own AI-powered products end to end, and I bring that same founder-level ownership to every client project. From fintech platforms with real bank connections to AI-powered wellness, health, and productivity apps, I design the user experience, engineer the backend, integrate the AI, implement monetization, and take products all the way to launch, App Store or web. What I bring to your project: ⌁ AI Engineering Production AI, not demos: multi-model systems across OpenAI, Claude, and Gemini with cost-tiered model routing, agent pipelines, and vision, voice, and reasoning features grounded in real user data, engineered for reliability, latency, and cost. ⌁ Full-Stack Development I build the entire system, includth FastAPI and PostgreSQL, as well as Firebase and Supabase for authreal-time synchronization, and server-side logic, plus Next.js hboards. ⌁ iOS & Apple Ecosystem Modern, modular Swift & SwiftUI (rk, Swift Concurrency) withpixel-perfect, first-party-qualiteMotion and AirPods sensor data,FamilyControls and Screen Time APs, Apple Watch, and macOS. ⌁ Fintech & Monetization Experience with Plaid integration2 subscriptions, and RevenueCat paywalls, with secure token manag ⌁ Security-First Engineering Hardened authentication flows, sege, and a clean App Store submission history with zero secuing I've shipped. Clients consistently highlight th • Translate complex product ideasiences. • Deliver quickly without sacrifi • Communicate clearly, set realis ownership of delivery. I approach every engagement as a task executor because I thinkabout your users, conversions, anof care I bring to my ownproducts.

Senior iOS Software Engineer with 15+ years in software development and 10+ years specializing in iOS. I've delivered 50+ mobile applications across enterprise environments including Royal Bank of Canada (Canada's largest bank), NETGEAR, and healthcare startups. What I bring to your project: • Native iOS expertise: Swift, SwiftUI, UIKit, Core Data, Watch SDK, Apple Pay, HealthKit • Cross-platform capability: React Native, Ionic — I've shipped on both iOS and Android • Modern architecture: VIPER, MVVM, Clean Architecture, Modular Design • App Store mastery: 50+ apps approved and launched, deep knowledge of the review process • Cloud & backend integration: Firebase, REST APIs, Amazon S3, real-time data sync Recent highlights: → NETGEAR: Designed scalable iOS architectures for smart home and networking apps (3 years) → RBC: Led modularization of Canada's largest mobile banking app serving millions of users (2 years) → Heartface: Built a video-review shopping platform MVP with video recording, playback, and e-commerce → Acuma Health: Developed a healthcare iOS app with Apple Watch integration and HealthKit → PetBooking: Re-architected an entire app from Objective-C to Swift using VIPER I'm based in Toronto, bilingual (English/Portuguese), and available for 30+ hours per week. I value clear communication, clean code, and delivering on time.

✅ Upwork Top Rated & Verified Mobile Developer Apple App Store Rankings: #74 Overall | #5 Sports | #25 “What’s Hot” | #11 Productivity ✔︎ 5-star rated | 100% Job Success | 15+ years experience ✔︎ 75+ projects completed | 50+ apps published to Apple App Store / Google Play ✔︎ Extensive iOS and Android experience (Swift, Objective-C, Kotlin, Java) Creating a modern app is a challenging task, so having someone to help you navigate through the many complexities of not only creating the app, but also getting it live on the store is necessary. I realize how important this project is to you, and with my experience and track record I will be your advocate throughout the entire process. Communication is key to the way that I develop software. With proper communication you can feel confident that all aspects of the app development are moving in the right direction. I will keep you aware of the apps’ progress both with frequent communication by phone/email/Zoom and with consistent updates that can be downloaded and installed on your devices. You are the expert on what the app needs and only you know what is going to work for you and your users. As a former teacher, helping people reach their goals comes naturally to me. I’m looking forward to helping you create the next great app! ------------------------------------------------------------------------------------------------------ Apps developed in these app store categories: Productivity, Medical, Health & Fitness, Sports, Utilities, Education, Games, Music, Books, Business, Lifestyle, Reference, Shopping, News, Navigation, Photo & Video, Food & Drink, Social Networking, Entertainment Large clients include: Stanford University, Monster Digital, UC Davis, Allegheny Health Network, Schroeder Publishing Co, Washington Suburban Sanitary Commission, Cambridge Health Alliance, VICIS Sporting Goods **Additional information available at my company’s website twosuntraders.com.

Senior software developer with 9+ years of professional experience. Specialized in native mobile development (iOS/Swift, Android/Kotlin & Java) with a strong full-stack background spanning AI/LLM applications, REST APIs, and cross-platform desktop products. Experience includes building and integrating large language models, setting up CI/CD pipelines, and shipping production apps across mobile, web, and desktop (React, Tauri, C#, Swift).

I build iOS apps from ideas to $1m+ ARR. 🚀 Just tap invite and let's jump on a call to discuss your project I've worked as a senior iOS developer and technical lead for the past 12 years, delivering apps used internally at Harvard University, Tesla, Danfoss, and FIFA World Cup. More recently I've become specialised in LLMs integrations (ChatGPT/OpenAI, Claude/Anthropic, Gemini) having created the PingMi, Loopsie and Rare based on Open AI / Chat GPT with 10+ million users. I'd be happy to look at taking on your mobile projects.

Built an app in Base44, Lovable, Replit or another AI builder and stuck at the App Store? I can get it approved, end to end, from native wrapping and code signing to TestFlight and Apple review compliance. But that is just one side of what I do. With 7+ years of professional iOS development experience and a 100% Job Success Score, I build and ship full-scale iOS apps from scratch using Swift, SwiftUI, and UIKit. Fast, clean, and App Store ready from day one. My expertise includes: - Base44 & AI-built app publishing: End to end App Store submission under your own developer account - App Store compliance & rejection rescue: Resolving Guideline 4.2, 4.3, and other rejections - SwiftUI & UIKit development: Building modern, scalable, and production-ready iOS apps - Bug fixing & performance optimization: Improving stability, speed, and memory efficiency - API & third-party SDK integration: Firebase, RevenueCat, push notifications, in-app purchases - Long-term support & team collaboration: A reliable iOS expert on call when you need one What sets me apart is that I understand both sides of the equation. I know how AI builders work and I know exactly what Apple expects. That means fewer rejections, faster approvals, and no surprises. Whether you need a new iOS app built from scratch, want your AI-generated app published to the App Store, or need an experienced engineer to rescue a rejected submission, I deliver on time with clear communication throughout. Let's talk and get your app live :)