Hire the Best Marvel App Freelancers
in Ukraine

👋 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!

🏆 6+ years of experience as a UI UX designer for SaaS, Mobile App Design, Web Design, Dashboard Design, eCommerce, Landing Page, Enterprise apps, Marketplace, and Event Management services. As a UI UX designer, I put much value on trustful, transparent, long-term relationships. That's why I'm very accurate in performing a professional approach. Your privacy, terms, and deadlines will always be respected. All I need to start is your specifications, a description of a problem you face, or just an initial idea of the future design product. But in case you are not sure at all - no problem. We will work out the product's vision together, and I will provide you with fresh and unique ideas and efficient methods to create something outstanding and productive. I will manage your design project from start to final result. Feel free to contact me to discuss the details. 👉 Design Type: Mobile App Design, Responsive Design, Software Design, Web Design, Custom Web Design, Game UI/UX Design, GUI Design, High Fidelity Design, Adaptive Web Design, Mobile UI Design, UI UX Designer, User Interface Design, User Experience Design. 🎯 Deliverables: Style Guide, Prototyping, Mockup, Website Asset 💪 My Skills: Design Mockup, Graphic Design, Interactive Design, Interactive Mockup, UI/UX Prototyping, User Experience Strategy, Visual Communication, Wireframing, Prototyping, Information Architecture, Competitive Analysis, User-Centered Design, Human-Centered Design, Interaction Design. ⚙️ Tools I use: • Figma, Sketch, Webflow • Axure RP, Balsamiq, Marvel App, InVision, Zeplin • Adobe Illustrator, Adobe XD, Adobe Photoshop

If you used tools like Cursor, Claude, Bolt, Lovable, Replit or v0 to speed up development and the app is now stuck at the “almost done” stage I can help you finish it and ship it. Many AI-assisted React Native projects run into the same blockers: unstable code patterns, production-only bugs, broken builds, store compliance issues, and performance that wasn’t optimized. 🏆I’m a React Native developer (Expo + RN CLI) building and stabilizing iOS & Android apps with TypeScript and a production mindset. My focus is turning a shaky MVP into a release-ready product you can safely maintain and scale especially for fast-moving startups (EU time zone). ⚙️ What I typically improve Clean up AI-generated code: structure, consistency, TypeScript hygiene, reliable state patterns Fix “works locally” problems: environment/config, build settings, permissions, native configs Resolve App Store / Google Play blockers: privacy, permissions, guideline compliance, release setup Performance: slow lists, unnecessary re-renders, navigation bottlenecks, memory spikes 🌍Integrations I work with often Backend: Supabase, Firebase Subscriptions: RevenueCat, Adapty, Superwall Analytics & attribution: AppsFlyer, Adjust, Tenjin, Meta SDK, TikTok SDK Push: OneSignal, Expo Notifications / FCM AI APIs: OpenAI, Whisper, Claude API Native features: camera, authentication, payments, deep linking 📱 Mobile Development Expertise: React Native (CLI & Expo) for cross-platform development Firebase (Authentication, Firestore, Cloud Messaging, Push Notifications) API Integration (RESTful APIs, GraphQL) App Testing, Debugging, and Optimization App Store & Google Play Deployment 💼 Industries I Work With: Crypto Apps E-commerce Apps Fitness & Health Tracking Education and Learning Platforms Social Media and Chat Apps Food Delivery and Booking Apps Utility and Productivity Tools 🚀 Why Choose Me: Dedicated developer with strong problem-solving skills Fast learner who adapts quickly to project requirements Clear communication and regular progress updates Focused on long-term collaboration and continuous improvement Passionate about writing clean, maintainable, and scalable code 📞Need a clean build from day one? I also develop apps from scratch with a scalable architecture and a single codebase for iOS/Android, ready for real users and store releases. 🔑 SEO for you my dear client 🙂 React Native, Expo, React Native CLI, TypeScript, iOS, Android, AI App Development, OpenAI, Supabase, Firebase, RevenueCat, OneSignal, AppsFlyer, Adjust, REST API, GraphQL, Performance Optimization, App Store, Google Play.

🔥 𝙄 𝙎𝙘𝙖𝙡𝙚 𝙂𝙖𝙢𝙚𝙨, 𝙁𝙞𝙭 𝙋𝙧𝙤𝙗𝙡𝙚𝙢𝙨, 𝙖𝙣𝙙 𝘿𝙚𝙡𝙞𝙫𝙚𝙧 𝙒𝙞𝙩𝙝 𝙋𝙧𝙞𝙙𝙚 – 𝙔𝙤𝙪𝙧 𝙎𝙪𝙘𝙘𝙚𝙨𝙨 𝙄𝙨 𝙈𝙮 𝙁𝙤𝙘𝙪𝙨 🔥 - 12 Years in Game Development - 70+ Projects Delivered - 20 000+ hours of Unity development experience 👋 Hi! I’m Ihor — a passionate game developer and creative problem solver. I turn ideas into polished games and immersive AR/VR experiences using Unity and top-notch design and I would be happy to help you with: 🎮 Game Design — game balance, level design, economy, and player engagement 🎨 2D Art & UI/UX — concept art, characters, environments, and intuitive interfaces 🛠️ 3D Art & Modeling — characters, props, environments, stylized and realistic ✨ Animations — character animations, VFX, and smooth motion 💻 Programming — cross-platform development, AR/VR, Windows, Android, iOS, MacOS and WebGL 🐞 QA & Testing — automated and manual tests (CI/CD pipelines) 𝐑𝐄𝐂𝐄𝐍𝐓 𝐒𝐔𝐂𝐂𝐄𝐒𝐒 𝐒𝐓𝐎𝐑𝐈𝐄𝐒: 💰 Secured $1M funding by delivering an MVP that impressed investors — Pickatale 💰 Delivered a challenging PvP mode after two senior devs failed — Cyberunity: Biogenesis 💰 Integrated VR & multiplayer features into a defense simulator, winning a Ukrainian Army contract — Design Bureau "Lohika" 💰 Developed a hyper-casual game with 2M+ — Love Water 𝐖𝐇𝐘 𝐂𝐇𝐎𝐎𝐒𝐄 𝐌𝐄? ➡️ Focused on quality, deadlines, and player experience ➡️ Deep understanding of game mechanics, multiplayer, monetization, and retention ➡️ Cross-platform experience — mobile, WebGL, VR/AR, Telegram, NFT ➡️ Full-cycle delivery — from idea and design to release and updates ➡️ Clear communication, flexibility, and full transparency 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋 𝐒𝐊𝐈𝐋𝐋𝐒: C# | Zenject | Strange IoC | Photon for Unity | Socket for Unity | Facebook SDK/API | Google SDK/API | Vuforia | Amplitude | Heyzap | AppoDeal | AdMob | Spine 2D | Dragonbones | NGUI | Prime [31] | Soomla | Flurry | OpenIAB | UnityADS | App42 | Infinario SDK | Addeals SDK| Parse | Chartboost | EveryPlay | RESTful API | VK API | PlayFab | Firebase | URP | HDRP | AssetBundles | Addressables | Microsoft Cognitive Services | Apple API | Sentry | GameDriver | Unit Tests | WebView | Vuplex | Deep Link | Defered Deep Link | Tobii Eye Tracker | Stable Diffusion AI API | AR | VR | AR Foundation | Unity development | Unity developer | Game Developer | Game development | Senior Game Developer | Unity Game Developer | Senior Unity Game Developer | AR/VR Developer | AR/VR Development | Augmented Reality | Virtual Reality | Augmented Reality Developer | Virtual Reality Developor | Mixed Reality | Mixed Reality Developer 💬Have an idea or stuck with a project? Let’s talk — I’m here to help!

👋🏼 Hey there! If you're ready to turn your ideas into reality, you're in the right place! I'm the business manager of a full-cycle development agency with over 6 years in IT, here to connect your business needs with simple and effective software solutions. With my experience, I can help with everything from planning and design to testing and maintenance throughout the entire development process. Our main skills cover: ✅ Making things look good (Logo Design, Branding, UX/UI design); ✅ Mobile app development (Java, Kotlin, Swift, React Native); ✅ Web development (React.js, Next.js, Node.js); ✅ Manual QA; ✅ AQA (JS, Java, Python frameworks). Count on practical software solutions that go beyond your expectations. My team is ready to suggest modern technical solutions and support you through easygoing discussions to refine your project's needs. We've helped both big businesses and startups. Give us a shout, and let's chat about the details.

Hi there! I believe in letting my work speak for itself. Here’s what I bring to the table: 🎨 Clean and intuitive UX/UI design 📐 Strong knowledge of design principles 📱 Familiarity with Human Interface Guidelines 🛠 Proficient in Figma tools: auto layouts, components, and prototyping 🧩 Clear and logical wireframing 🔲 Expertise in the 8-grid layout system 🚀 Responsive design for all screen sizes 🎯 User-centered design focused on solving real problems 🔄 Experience with design systems for consistency and scalability ⚡️ Interactive prototypes to bring ideas to life 📊 Ability to apply user research and feedback to improve designs If you’re looking for thoughtful, user-friendly, and well-structured designs, feel free to reach out - I’m ready to deliver great results! 🔑 Keywords Mobile App Design, UI Design, UX Design, Interaction Design, User Flows, Wireframing, Prototyping, App Redesign, Accessibility Design, Responsive Design, Cross-platform Design, Minimalist UI, Functional Design, Intuitive Design, Scalable Design Systems, Usability Testing, Visual Hierarchy, Typography, Color Theory, iOS App Design, Android App Design, Material Design, Human Interface Guidelines (HIG), App Store Optimization (ASO), Flutter UI Design, SwiftUI Design, React Native UI, Figma, Adobe XD, Sketch, InVision, Zeplin, Protopie, Balsamiq, Miro, Canva, Principle, Axure, Marvel App, Overflow, Modern UI, Clean Design, Flat Design, Minimalism, Neumorphism, Skeuomorphism, Glassmorphism, Dark Mode Design, Light Mode Optimization, Adaptive Design, Micro-Animations, Motion Design, Data Visualization, Infographics, Agile Design, Lean UX, Design Thinking, User Research, A/B Testing, Design Sprints, Storyboarding, Journey Mapping, Competitive Analysis, User Personas, Heatmap Analysis, Branding, Logo Design, Icon Design, Illustration, Custom Icons, Typography Design, Interactive Design, Product Design, Mockups, Clickable Prototypes, Design System Creation, Social Networking App Design, Messaging App UI, E-commerce App Design, FinTech App UI, Health & Fitness App UI, SaaS Platform UI, Utility App Design, Travel App UI, Food Delivery App UI, Educational App Design, Productivity App Design, UI/UX Freelancer, Mobile Design Expert, UI Specialist, UX Consultant, App Design Professional, User-centered Design, Creative Problem Solving, UI Trends, UX Principles