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Senior iOS Developer with 14+ years building apps that ship — from zero-to-App Store MVPs for startups to scaling complex codebases for established products. 🚀 What I can help you with: ✅ New iOS app — Swift, SwiftUI, UIKit from scratch ✅ MVP development — concept to App Store submission ✅ Legacy app rescue — refactor Objective-C to Swift, fix crashes, improve performance ✅ Feature development — in-app purchases, push notifications, location, media, APIs ✅ Code review & architecture — MVVM, MVC, clean architecture ⚙️ Core technologies: 🔹 Swift · SwiftUI · UIKit · Objective-C (legacy support) 🔹 Firebase (Auth, Realtime DB, Push, Dynamic Links, Messaging) 🔹 CoreData · SQLite · RESTful API integration 🔹 AVFoundation · CoreAudio · MapKit · StoreKit 🔹 In-app purchases · Push notifications · GPS · Photo/Video/Audio 🔹 Git · CocoaPods · Swift Package Manager 🔹 App Store submission · TestFlight · deployment I've worked across fintech, social, media, and entertainment apps — including integrations with Facebook, Google, Instagram, Twitter, YouTube, and Vimeo. I also have cross-platform experience in Cocos2d-x (iOS & Android). I use AI-assisted development tools (Claude, Codex) to ship faster without cutting corners on code quality. 14 years means I've seen every edge case, debugged every crash type, and shipped under every kind of deadline. You get a developer who moves fast and doesn't disappear. 📩 Send me your project brief — I'll respond within 4 hours.

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. 🚀 iOS Developer | Swift, SwiftUI & Native Mobile App Development As an iOS Developer with 9+ 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.

👋 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 bring decades of experience in building software with a mission of delivering exceptional results at an impressive pace. 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) — Vision Pro, Apple Watch, and Apple TV apps — Product management & expert advice for 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 Opus and GPT-5 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. We also communicate freely, Ukrainian, Polish, and Russian. Don’t hesitate to send me a quick message and we will go over your idea in detail over a video call or through Upwork chat!

⚕ 100% Job Success-oriented work. ⚕ Open-minded person, ready to learn anything, easy to work with. ⚕ Self-motivated, strong organized, reliable, dedicated, fast learner and hard working iOS developer. ⚕ Excellent logical, analytical and computational skills. I’m an iOS developer with 3+ years of hands-on experience building apps end-to-end and shipping 30+ releases to the App Store. I mainly work in Swift (and use Objective-C when needed), and I’m comfortable taking a product from “Figma + API docs” all the way to a polished, stable production build. I work across both UIKit and SwiftUI, building clean, responsive interfaces with Auto Layout and modern state-driven UI patterns. I’ve implemented reactive flows with Combine and RxSwift, and I focus on making apps feel fast and reliable through careful performance work and stable architecture. My core interests are products where audio, AI, and real-world context matter. I’ve integrated OpenAI Whisper for transcription, built audio playback features with AVFoundation and AudioKit (including EQ/effects), and shipped location-based functionality using MapKit and Core Location. On the “production” side, I’m comfortable with secure authentication (Face ID / Touch ID, CloudKit), solid data layers (Core Data, Realm, Firebase), and scalable code structure (MVC, MVVM, VIPER where appropriate, SOLID, Clean Architecture). For networking, I’ve built REST API integrations with JSON using URLSession and Alamofire-style stacks, with proper error handling, retries, and clean separation between networking, domain logic, and UI. Design implementation: pixel-perfect UI from Figma, responsive layouts for all screen sizes Quality & performance: optimization, stability, clean code practices I care about shipping apps that don’t just work, but feel polished: clear UI, smooth interactions, maintainable architecture, and performance you don’t have to apologize for later.

With 7+ years building iOS and cross-platform apps, I know how to ship products that scale, retain users, and generate revenue. I work directly with founders and CEOs who need a developer they can trust to own delivery end-to-end. ────────────────────────────── WHY FOUNDERS CHOOSE ME ────────────────────────────── • Honest scoping: I give you real estimates, not the number you want to hear. • End-to-end ownership: From architecture to App Store approval - I handle it all. • 100% Job Success Rate across all client engagements on Upwork. ────────────────────────────── AI-ACCELERATED DEVELOPMENT ────────────────────────────── I actively integrate AI into every stage of my workflow - not as a gimmick, but as a force multiplier that directly benefits your project: • AI-assisted coding & code review: I use AI tools daily (Cursor, GitHub Copilot, Claude) to write, refactor, and audit code faster without sacrificing quality. • Prompt Engineering: I design and optimize prompts for AI features inside apps - from LLM API integrations to on-device ML pipelines. • Vibe Coding: I can rapidly prototype full working features from a brief description or rough wireframe, compressing weeks of back-and-forth into days. This is a genuine competitive advantage for early-stage founders who need to validate ideas quickly as mobile developer • Outcome: Faster iterations, lower cost, and more time spent on what matters — your product's core value. ────────────────────────────── WHAT I DELIVER ────────────────────────────── • IOS Developer (Swift, SwiftUI, UIKit, Objective-C) & Mobile Developer (Flutter, React Native) • Clean Architecture, MVVM-C - code your next developer will actually understand • Monetization: StoreKit 1/2, RevenueCat, subscriptions, paywalls — built to convert • Legacy Modernization: I'm one of the few devs who can safely refactor Objective-C without breaking production • App Store Delivery: Certificates, provisioning, review rejections - 100% approval rate ────────────────────────────── INDUSTRY EXPERIENCE ────────────────────────────── • Fintech & Payments — Invoicing platforms, Stripe/PayPal/Apple Pay, multi-region flows • SaaS & Productivity — 50k+ DAU ecosystems with AI integration, WebSockets, real-time sync • GIS & Navigation — Offline-first MapBox routing, background GPS, battery optimization • Media & Streaming — Custom video players, multi-level caching (−1.5s playback latency) • B2B Field Tools — GPS time tracking with geofencing for 100+ construction sites • Social & Gaming — Real-time multiplayer with WebSocket state sync, voice, IAP • Sports & Training — Structured coaching programs with progress tracking • E-commerce & Retail — High-load cart sync, loyalty programs, cinema booking ────────────────────────────── TECHNICAL STACK ────────────────────────────── Mobile: Swift, SwiftUI, UIKit, Objective-C, Flutter (Dart), React Native (TypeScript) Architecture: Clean Architecture, MVVM-C, VIPER, Modularization (SPM) AI & ML: LLM API integration, CoreML, Vision Framework, Prompt Engineering Data: Core Data, Realm, Firebase, Firestore, SQLite (Drift) Networking: URLSession, Alamofire, GraphQL, WebSockets, REST CI/CD: Fastlane, GitHub Actions (−30% deployment time) ────────────────────────────── WHY WORK WITH ME ────────────────────────────── • No Over-Engineering: Right tool, right job - I protect your budget. • AI-Powered Speed: I deliver in days what others quote in weeks. • Revenue-Focused: I've shipped monetized apps with subscriptions and premium features - I understand that launching is just the beginning. • Direct Communication: Clear updates, honest estimates, zero corporate jargon. • Long-Term Reliability: I build apps meant to last, not just pass the initial review. Have an app idea or a product that needs rescuing? Click "Invite" - let's talk.

🤝 𝗟𝗲𝘁'𝘀 𝗯𝘂𝗶𝗹𝗱 𝗮𝗻 𝗮𝗽𝗽 - 𝘀𝘁𝗮𝗯𝗹𝗲, 𝗳𝗮𝘀𝘁, 𝗮𝗻𝗱 𝗶𝗻𝘁𝘂𝗶𝘁𝗶𝘃𝗲. I'm an iOS Developer and Swift iOS Developer who builds products people actually enjoy using and businesses can confidently scale. As an iOS Developer with over 8 years of experience, I specialize in full-cycle iOS Development for startups, SaaS companies and growing businesses. As a Swift iOS Developer and Mobile App Developer Ukraine, I deliver production-ready, scalable, user-centered apps through structured ios mobile app development and modern iOS Development practices. As a Mobile Developer and mobile application developer, I helped clients achieve: 📈 Increased in-app conversion rates by 18-35% through UX optimization 🚀 Reduced crash rates below 0.5% via structured testing and debugging ⚡ Improved app load speed by up to 40% 💰 Increased user retention through performance-focused iOS Development 🔁 Faster feature rollout cycles with modular architecture 💡 Tech Expertise of an iOS Developer As a seasoned iOS Developer and swift mobile developer, I provide: 🔸 Full-cycle Swift iOS Development and swift ios development lifecycle management 🔸 Structured ios application development and ios development planning 🔸 Advanced API Integration (RESTful APIs, JSON) 🔸 Real-time solutions with Firebase 🔸 Push notifications & background services 🔸 Local & remote data storage (Core Data, SQL) 🔸 Performance optimization & Software Debugging 🔸 Version control with Git 🔸 CI/CD and App Store deployment 🔸 User Authentication As a Swift iOS Developer, I treat code review and clean commits as part of the job, not an afterthought. 🔋 My Approach to iOS & Mobile Projects As a senior iOS Developer, I manage the full Mobile App Development cycle: 1. Technical discovery & architecture planning 2. Clean and scalable iOS Development 3. Structured testing & Software Development best practices 4. Performance optimization 5. App Store deployment As an experienced Swift iOS Developer, my daily core environment is Swift, SwiftUI, UIKit and Objective-C, Apple Xcode, PostgreSQL, Dart. My iOS Developer approach to iOS Development ensures performance optimization, clean architecture and intuitive UI/UX to ensure stable, scalable ipad app development. My background as an iOS Developer in swift ios development allows me to build secure, high-performance apps with structured architectures like MVVM and Clean Architecture - essential for long-term iOS Development success. I've worked across mobile app design, occasionally as an ai chatbot developer building conversational features, and as an ios game developer creating interactive experiences. 🧩 Cross-Platform & Flutter Development Beyond native iOS Development, I work confidently as a flutter developer and full stack mobile developer. I've contributed to multiple scalable flutter apps, worked with bubble io certified developer mobile app workflows, and collaborated closely with more than one flutter developer team to align mobile architecture with backend services. My exposure to React Native and flutter strengthens my overall ios mobile app development expertise and allows seamless integration between native and hybrid solutions. I also work with figma mobile app handoffs, turning designs into production-ready flutter and Swift iOS Developer builds. My experience as a Mobile Developer also extends beyond Apple's ecosystem. I regularly collaborate with an android developer team and participate in android development and Android App Development workflows. I understand Android, Kotlin and Java, which helps maintain consistent architecture across platforms - a real iot development use case in several connected-device projects. I'm not only an iOS Developer, I have experience as a full stack developer and full stack mobile developer, integrating backend logic, databases and APIs into robust Mobile App Development pipelines. I also work with web developer teams and UI specialists on iOS Development, mobile app design and cross-device consistency. On select projects I've stepped in as an ai mobile app developer and ios developer ai, integrating lightweight AI features such as recommendations or smart automation directly into iOS apps - though my core focus remains native iOS Development, Swift iOS Development and flutter. Throughout every Mobile App Development project, as a Swift iOS Developer I apply Agile Software Development methodologies to ensure predictable delivery, transparency and measurable progress. I also support mobile app marketing efforts with App Store optimization input, since a great mobile app developer should understand how an app gets discovered, not just how it's built. As a Swift iOS Developer, swift mobile developer and flutter developer, I collaborate closely with android developer, designers and product teams on every Mobile App Development project - delivering reliable iOS Development and flutter solutions from discovery through App Store launch.