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For sixteen years, I work as an iOS Developer. During this time, I have completed many projects. More than half of my projects are client applications for servers. I understand how such applications are arranged. How to receive the data from a service using a REST API. I know how to parse a service response and display it in an app and create offline mode. I have experience with video and audio. I can combine video files, put sound on them, change this sound, add text or image to the resulting video. I worked with video and audio players and recorders. I worked with Maps. I can display places on this map, present custom callouts on it, and show routes from a user location to these places. I also can work with the CoreData framework. I know how to get data from a database on a thread and display it to a user without an interface freezing. In 2017 I decided to create some apps on my own. My friend is a radiologist, and he shared with me his idea about a medicine app. We have created this app and published it to AppStore. You can find it if you search for RadAnatomy and RadAnatomyLite. 50% of the proceeds I transfer to my friend. During the work on this app I put myself in the place of customers and gain the priceless experience how an idea is embodied to the app. I can use Photoshop and Sketch, and you do not need to slice images. Just provide me a file with a design. The rest I will do by myself. I pay attention to pixel-perfect and custom fonts because I respect designer work

🚀 AVAILABLE TO START ⚡Top 3% of Talent in iOS & 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 Mobile Development ⚡ Experience Building 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 Mobile Apps, SaaS Platforms & Enterprise Solutions 🤖 Modern 𝐀𝐈 𝐓𝐨𝐨𝐥𝐬 Including Cursor, Claude Code, GitHub Copilot, GPT-4/GPT-4o & Claude Sonnet 👉 WHAT YOU GET ✔️ Senior iOS Developer & AI App Developer - 10+ years experience, intelligent high-performance builds, extreme client impact, end-to-end ownership. ✔️ Swift iOS Developer - native modern interfaces, 18–27% user engagement lift, custom ChatGPT integration, and ultimate trust. ✔️ iOS Mobile App Developer - 30–40% faster release cycles, cleaner AI/UX workflows, stronger user retention across Mobile SaaS platforms. 👉 ACHIEVEMENTS ✔️ 10+ years, 17,000+ hours, dozens of products delivered as a native iOS developer, swift developer, and senior full stack developer ai and mobile application developer workflows. ✔️ Massive client impact and direct revenue generated through full-cycle development as a top-performing iOS developer ai specialist and Apple app developer. ✔️ 100,000+ active users on a popular festival companion app where native iOS mobile app development execution lifted repeat engagement by 27%. ✔️ 10,000+ users in Healthcare App and medical-compliant systems where iOS application development cut data friction by 40% using an intuitive doctor directory website layout. ✔️ High-converting generative AI pipelines, 34% faster action handling in E-commerce Marketplace App, smart assistants, and Fintech App deployments as an experienced iOS developer. ✔️ 90% faster mobile processing and local LLM execution, 80% lower client-side crash workload, 65% fewer server-roundtrips through clean API Integration, push notifications, and iOS developer ai features. ✔️ 5–8 weeks shorter Startup MVP to Pilot Launch, 35% fewer bugs through refactor existing codebase tasks, smart automation, and clean App Store submission pipelines. 👉 WHERE I DELIVER ✔️ As an iOS developer ai specialist - engineering smart features, OpenAI API configurations, Claude API integration, voice AI, and generative AI features into native mobile application development. ✔️ As a SwiftUI developer - dynamic systems with pixel-perfect design, smart assistants, local storage, and complex UI layout across iOS mobile app development and Mobile SaaS infrastructures. ✔️ As an experienced iOS developer - native applications and AI-powered mobile application frameworks built from scratch, delivering 30–40% faster iteration cycles. ✔️ As a native iOS developer - clean MVVM, MVC, and Clean Architecture implementation with secure backend API integrations from Early-Stage Prototype to live product launch. ✔️ As an iPhone app developer - complex core features including OAuth, Apple Sign-In, image & vision processing, audio transcription, in-app purchase setups, and multi-tier subscription systems with RevenueCat. ✔️ As a mobile software engineer - handling advanced audio/video solutions, geolocation services, location tracking, Apple Maps, and real-time chat messaging using WebRTC. ✔️ As a long-term iOS developer - driving ongoing maintenance, smart feature enhancement, bug fixing, and performance tuning as a reliable long-term collaboration partner. 👉 INDUSTRY IMPACT ✔️ AI Mobile App & Smart Assistants - ChatGPT integration, custom AI chatbot agents, voice AI features, generative AI prompts, LLM tools, and automated smart recommendations. ✔️ Fintech App & Wallet Systems - secure mobile banking apps, online payment setups with Stripe and PayPal, and robust local data storage solutions. ✔️ Healthcare App & Telemedicine - secure health tracking platforms, medical records access, and real-time data sync for complex health environments. ✔️ Marketplace App & Booking Systems - scalable service marketplaces, real-time booking, automated push notifications via APNs, and interactive user reviews. ✔️ Fitness App & Workout Platforms - custom sports systems, automated coaching apps, and full-cycle development for high-end Golf Training & Coaching Platforms. 👉 HOW I BUILD ✔️ 10+ years as a mobile app developer: engineering applications with Swift, SwiftUI, UIKit, Xcode, OpenAI API, Claude API, and Objective-C for legacy codebase migration and system scaling. ✔️ Architectural patterns and clean execution: utilizing MVVM, MVC, Clean Architecture, and VIPER alongside Core Data, Realm, and Firebase Cloud Messaging. ✔️ End-to-end product deployment: driving the entire cycle from Proof of Concept, prototype development, QA & DevOps integration, up to a successful publish to App Store workflow. Looking for an elite Senior iOS Developer, Swift Developer, or a trusted ai mobile app developer who can build an iPhone application from scratch, build an AI-powered iOS application, or handle full-cycle end-to-end development? Let's connect! Send an invite and let’s talk about your project goals. ☎️

𝟮𝟬+ 𝗮𝗽𝗽𝘀 launched, with 𝟭𝟬 𝘆𝗲𝗮𝗿𝘀 of experience building native iOS and macOS apps. 💬 Get 𝗙𝗥𝗘𝗘 20-minute consultation! I’ll review your requirements, discuss the technical approach, and answer any questions. 🤖 Using Codex and Claude Code to 𝗱𝗲𝗹𝗶𝘃𝗲𝗿 𝗳𝗮𝘀𝘁𝗲𝗿 and 𝗿𝗲𝗱𝘂𝗰𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗰𝗼𝘀𝘁𝘀, with every change reviewed to ensure 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻-𝗾𝘂𝗮𝗹𝗶𝘁𝘆 code. As an iOS Developer with 10+ years of experience in Native Mobile App Development, I specialize in building iOS applications with Swift, SwiftUI, UIKit, and Objective-C. I work on production systems with a strong focus on performance, stability, maintainability, and delivering a polished user experience. 💡 Why clients work with me ✅ Native iOS Developer focused exclusively on Apple platforms ✅ 9+ years of hands-on iOS development experience ✅ Strong experience with large and legacy codebases ✅ Production-focused development approach ✅ Clean, scalable, and maintainable architecture ✅ Fast iteration using AI-assisted development workflows ✅ Reliable communication and long-term support I’m comfortable working on both MVPs and long-term products, including apps with complex business logic, real-time features, offline-first architecture, CloudKit synchronization, and App Store releases. My expertise includes: ✔️ Building native iOS apps from scratch ✔️ Improving and maintaining existing apps ✔️ Fixing crashes, bugs, and unstable behavior ✔️ Refactoring legacy UIKit / Objective-C codebases ✔️ Migrating apps to SwiftUI ✔️ Performance optimization & debugging ✔️ API integrations, subscriptions & push notifications My technical expertise includes Swift, SwiftUI, UIKit, Objective-C, CoreData, SwiftData, CloudKit, StoreKit, Firebase, AWS, REST APIs, RevenueCat, AppsFlyer, real-time systems, subscriptions, and push notifications. Have an iOS app to build, improve, or fix? Let’s discuss your goals and how I can help.

Hi, my name is Oleksii, I I've been developing for Apple platforms since 2012. During my career I've worked at MacPaw and before that at Onix-Systems. Also sometimes I work on my pet project - Evenly. Currently I freelance and maintain MacPaw/OpenAI GitHub repo as a contractor. My expertise lies in apps that do most work on the client side (On-Device, without backend). For example, recently I've worked on integrating MLX models locally into the macOS assistant app (Eney) to enable its AI capabilities . Also, the apps I've work one would work heavily with database and file system, either directly or through corresponding frameworks: Core Data, PhotoKit, GRDB etc. Such apps would usually require efficient utilization of CPU and memory, so I’ve mastered tools for that: Grand Central Dispatch (GCD), Combine, Swift Concurrency When it came to more specific work, we would also do that on-device using both Apple and 3-rd party frameworks: OpenCV, Vision, AVFoundation, Core ML, MLX I like to organize the code in a way that makes sense. There are many best practices on how to do a better organization: SOLID, composition over inheritance, less coupling more cohesion, using design patterns etc. I know most of it and have an experience using them, so now I don’t just use complex stuff for the sake of it, but apply what’s needed where needed I am also a fan of keeping quality and performance in check, so I would use Crashlytics, Sentry, MetricsKit to log errors, collect metrics and keep an eye on crashes Not 100% of the time, but more and more I use TDD to do faster initial implementation through a short feedback loop, and also to be more sure that I don’t break anything during refactoring later I’ve also come across many very hard-to-debug issues in my career, so I had to become better at debugging. I like to use Instruments like Profiler to find inefficient CPU usage. I also usually prepare logging in advance so that when user has an issue and we can’t reproduce it locally, we could get as much information from them as we can without asking them 10 times. I enjoy automation, so when there is a chance, I would gladly write a script or use some tool or technique to not do it manually and save time. Below are some info about my precious employment. See Employment History on Upwork Profile for more details. First half of my career was in outsource company Onix-Systems, where I worked on a lot of very different projects, estimated pre-sales, and lead the whole iOS department of the company. During that time I also made my own startup of a simple loan recording app Evenly, which was my main playground to learn some development/product/marketing topics deeper that I could while working main job. Then I moved to MacPaw which is a product company, where I've worked for 6 years in a product team. There I learned industry standards and state of the art approaches to full-cycle development of a product, marketing, working in a focused team, development processes, infrastructure etc. There I worked on such apps: Gemini Photos (now CleanMyPhone), Gemini 2, Swoosh Video Editor.

30+ iOS apps live on the App Store. 10+ years of dedicated Apple development. 100% Job Success Score. I am not a generalist who "also does mobile." This is all I do. Most developers spread themselves thin across React Native, Flutter, Android, and whatever else is trending. I made a different choice: go all-in on Apple and become genuinely world-class at it. Every project I ship runs on pure Swift and SwiftUI — no cross-platform shortcuts, no compromises on performance, and zero sacrifices on native feel. What my Apple-exclusive focus means for your budget & timeline: ⚡ No learning curve: I know Xcode, App Store Connect, and TestFlight cold — you don't pay for my research. ⚡ Scalable architecture: Solid foundations from day one mean no expensive rewrites 6 months down the road. ⚡ Zero surprise rejections: I know the App Store Review Guidelines inside out. ⚡ Advanced Apple features done right: Smooth implementation of WidgetKit, Live Activities, iCloud sync, StoreKit 2, and Sign in with Apple. 🛠 Tech Stack I Use Every Day: Swift • SwiftUI • UIKit • CoreData • CloudKit • WidgetKit • StoreKit 2 • HealthKit • WatchKit • XCTest • Fastlane • TestFlight 📈 My Track Record on Upwork & Beyond: Top Rated badge with a 100% Job Success Score 10+ years of iOS experience (5+ years delivering top-tier projects on Upwork) 30+ shipped apps with 4.5★+ average ratings 10,000+ combined app downloads 🤝 I work best with: Founders and product teams who want a developer who cares about the product's success, not just closing Jira tickets. If native feel, flawless App Store performance, and clean Swift code matter to you — we’ll be a perfect fit. Let’s talk: Drop me a message with a brief overview of what you're building. I respond within a few hours and am happy to jump on a quick discovery call to see how I can help bring your app to life. Updated: 03.09.26

👋 My name is Yuri — I'm Upwork's #1 iOS developer in Ukraine. I'm the founder and lead engineer at Helicon, an award-winning mobile development team. Together, we blend decades of software experience with a mission of delivering category-leading apps. Are you looking to create an app and need an expert developer who speaks fluent English? I specialize in: — iOS development (UIKit, SwiftUI) — macOS development (Cocoa, SwiftUI) — iPad, Vision Pro, Apple Watch, and Apple TV apps — Consulting for Apple-native software projects. At Helicon, we are skilled in most of the well-known Swift frameworks as well as third-parties. See the full list below: — UI Frameworks: SwiftUI, UIKit, Combine, RxSwift, The Composable Architecture (TCA) — Backend & Auth SDKs: Firebase, AWS Amplify, Supabase Swift, Auth0, Appwrite — 3D Frameworks: RealityKit, ARKit, SceneKit, Model I/O, Quick Look — Networking Libraries: URLSession, Alamofire, Moya, Apollo iOS, gRPC — Image & Animation Libraries: Kingfisher, SDWebImage, Nuke, Lottie, AVFoundation — Data Persistence Libraries: SwiftData, Core Data, Realm, GRDB, KeychainAccess — Analytics & Monitoring Tools: Firebase Analytics, Mixpanel, Amplitude, Sentry, Branch — Payments & Subscription SDKs: StoreKit, RevenueCat, Adapty, Stripe, Paddle — Developer Tools & Dependency Managers: Swift Package Manager, CocoaPods, Carthage, SwiftLint, SnapKit — Device & Platform Frameworks: CoreLocation, MapKit, HealthKit, CoreBluetooth, WidgetKit I can also assist you with app distribution, marketing, and launch using: — App Store Connect — Apple Developer Platform — Apple Search Ads — Meta Ads Manager (f.k.a. Facebook Ads Manager) My team has first-hand expertise in applying AI models like Claude Fable 5 and GPT-5.6 Sol to the mobile development workflow, allowing us to offer a great turnaround time for your project without ever sacrificing the human touch. Advanced English proficiency is a requirement for every developer working at Helicon. Additionally, our team members speak Ukrainian, Polish, and Russian. Send me a quick message and we will go over your idea in detail over a video call or an Upwork chat! Use the code word "INTRO" to get a free 30-minute session with me — I will help you navigate the fundamentals of building an iOS app and choosing the tech stack that best matches your users' needs.