Hire the Best iOS Developers
in Poland

⚡ 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 𝗺𝗲 "𝗔𝗨𝗗𝗜𝗧" - get a free 30-min 𝗦𝘄𝗶𝗳𝘁 technical review of your app idea, architecture, or existing Swift codebase. No sales pitch. Just honest Swift engineering feedback. I'm Siarhei - Swift engineer, ex-CTO x 3 funded startups, CEO of Sparkler Soft. We build native iOS products in Swift that ship, scale, and raise - with Kotlin/Android as the companion platform when needed. 🔵 𝗣𝗥𝗢𝗩𝗘𝗡 𝗥𝗘𝗦𝗨𝗟𝗧𝗦 ◈ 𝗶𝗛𝗮𝗶𝗿𝗶𝘂𝗺 - AI Hair Diagnostics Native Swift app with Core ML neural network, live on the App Store 100K+ training images, 95-98% accuracy $600K angel round + $5M seed valuation Revenue x10 to x1000/month in early stages Google & Amazon grants, 1,000+ clinic partners onboarded ◈ 𝗘𝗰𝗼-𝗚𝗼 - Electric Scooter Sharing Platform Swift iOS app, Kotlin Android counterpart, backend + IoT + admin panel AWS IoT Device Management, swappable battery infrastructure Named "Best Startup of the Region" ◈ 𝗕𝗟𝗘 𝗪𝗲𝗮𝗿𝗮𝗯𝗹𝗲 𝗔𝗽𝗽 Swift for iOS, Kotlin for Android, both live on App Store + Google Play HealthKit + Health Connect, RevenueCat subscriptions, BLE background sync Shipped on schedule, 5.0 client review ◈ 𝗢𝗽𝘁𝗶𝗰𝘀 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 (White-label, Strict NDA) Swift-built AI-assisted frame & lens selection via device camera, Kotlin on Android Active in 60+ countries, 1,000+ fitting points worldwide 10+ years on market, award-winning at international exhibitions ◈ 𝗖𝗵𝗶𝗯𝗯𝗶𝘀 - Unified Food Delivery Service Swift iOS app + Kotlin Android + web + admin panel + CMS 600+ restaurants, 150+ cities One of the country's leading delivery platforms ◈ 𝗖𝗼𝗶𝗻𝗙𝗼𝗿𝗦𝗵𝗼𝗽 - Crypto Marketplace Swift (iOS) + Kotlin (Android) + React web Non-custodial wallets, smart contract payments BTC, ETH, BCH, LTC, XMR, TRX - 100% MVP delivered ◈ 𝗔𝘇𝗮𝗿𝗶𝘂𝗺 - NFT Real Estate Investment Platform Swift-first build, fractional property ownership via blockchain MAS-regulated, live construction webcam in-app Min investment from $200, expected ROI 30-60% 🟠 𝗪𝗛𝗔𝗧 𝗪𝗘 𝗕𝗨𝗜𝗟𝗗 𝗜𝗡 𝗦𝗪𝗜𝗙𝗧 Native iOS: Swift, SwiftUI, UIKit, Objective-C Swift Core ML - on-device neural networks, camera diagnostics Swift + TensorFlow Lite, OpenCV - real-time image analysis Swift StoreKit - subscriptions, in-app purchases HealthTech & AI apps built natively in Swift FinTech & Crypto: Swift wallets, KYC/AML, Stripe, smart contracts, NFT Full-stack products: Swift app + backend + admin panel + CMS API integrations: Stripe, Mapbox, Sumsub, Firebase, HealthKit, any third-party When the project needs Android too, Kotlin runs alongside as the native counterpart - same architecture, same data contracts, built by the same team. 🟡 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 Mobile: Swift, SwiftUI, Objective-C, UIKit, Kotlin, Java Backend: Java Spring Boot, Node.js, NestJS, Golang Frontend: React, Next.js AI/ML: Swift Core ML, TensorFlow Lite, OpenCV Cloud: AWS, GCP, Azure, Docker, Kubernetes, CI/CD Data: PostgreSQL, MongoDB, Redis, Elasticsearch Security: OAuth2, OIDC, JWT, Keycloak, Biometrics, Swift StoreKit 👉 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 "𝗔𝗨𝗗𝗜𝗧" - 30 minutes to see if our Swift team is the right fit.

Most developers will build what you ask for. I help you build what actually works. I’m a mobile app developer with 10+ years in IT and a small team behind me. We help startups go from idea → MVP → scalable product - not just code. At the same time, I’m building my own SaaS product, so I understand the full journey: validation, MVP, users, retention, monetization. 🚀 How I can help you - Turn your idea into a clear MVP plan - Build fast using FlutterFlow + Flutter - Avoid overbuilding and wasted budget - Design product logic, not just screens - Prepare your app for real users & growth 👉 Already have everything defined? We can jump straight into development and deliver efficiently. 🎨 Design support - UX/UI design from scratch - Improving existing designs - Product-focused user flows (not just visuals) 📱 What I do - MVP development (fast & lean) - FlutterFlow development - Flutter app development - Full-cycle product development - Firebase / Supabase backend - Subscriptions (RevenueCat, Stripe) ⚡ Why clients choose me Because I don’t think like a freelancer. I think like a product partner: - I challenge weak ideas - I simplify scope to launch faster - I focus on what brings real value ⚠️ Not a good fit if: - You’re looking for the cheapest option only - You want someone to blindly follow tasks ✅ Perfect fit if: - You’re building a startup or MVP - You want to move fast and build it right - You need someone to think with you, not just code 💬 Send me your idea, Figma, or even a rough concept - I’ll break it down and suggest the best way to build your MVP.

Hello! I'm an AI engineer, full-stack iOS/Android/JavaScript/TypeScript/React/React Native developer and problem solver with more than 17 years of experience. Specializing in MERN and LAMP stacks, artificial intelligence (AI) and AI agents. I embrace modern AI-powered development workflows using tools like 🤖 Claude Code, 🧠 Cursor, 🏄 Windsurf IDEs and 🌀 Codex. What I do: 📱 Mobile apps, 🖥️ Desktop apps, 🌐 Websites, ⚙️ Web services, 👨🏻‍💻 Admin Backends, 🧩 API for them, 🤖 AI agents and ChatGPT/Claude integrations. 🚀 My own products: I don't only build for clients — I have four apps live on the App Store, each shipped end to end alone, from idea to release, and kept running. 🕰️ Insight Countdown is a countdown app for iPhone, iPad and Mac: SwiftUI, SwiftData, private iCloud sync, widgets, and an alarm that rings through silent mode and Focus. 📶 WiFi QR Studio turns a network into a print-ready, frameable card laid out at exact physical size. 🔠 See Text puts the texts you keep being asked for on your device's full screen in large type or as a QR code, or copies them to the clipboard — license plate number, phone number, email, booking reference, etc. 🍉 Melotris is a watermelon-packing puzzle game for iPhone and iPad, built natively in SwiftUI. All four have multilingual marketing sites in Astro and Tailwind. So when I estimate your project, I'm estimating work I've done for myself — store review, crash reports, support and updates included. 🤖 AI agents: I've shipped an AI agent handling inbound marketplace leads for live paying customers. It acts on an external event with nobody pressing anything, takes real actions in the world (replies to a person in chat, sends SMS, starts a phone call), follows up hours and days later, keeps conversation state and changes its own later behaviour from what it reads. What separates that from a demo is predictability, and that's where the engineering goes: making bad output structurally impossible to send rather than asking the model nicely, idempotent delivery so a retry can't message someone eleven times, and switches that fail toward the safe side. Kinds of software I've created: 🛍️ Shopping & online stores, 🏃 Sports, 🎮 Games, 🧘 Medicine & well-being, ✈️ Travel, 💰 Bank systems, 📣 Ad networks, 🛡️ Insurance, 🛬 Landings. I have strong skills in the following programming languages: 📜 TypeScript, ☕ JavaScript, 🦅 Swift, 🎯 Objective-C, 🐘 PHP, 🐱 Kotlin, ☕ Java. Frameworks and technologies: 🦕 Deno & Node, ⚛️ React, ⚛️ React Native, 🤖 ChatGPT API, 🔮 Anthropic AI API, 🌟 Google Gemini API, 🅰 Astro, ⚡️ Vite, 🐻 Zustand, ⚛️ Electron, 🆁 Redux, 🆁 Redux Toolkit, 🐆 Nest js, 🅽 Next js, 🆅 Vue, 🅰 Angular, 🐆 Fastify, 🥤 Fresh, 🅰 Apollo GraphQL Client and Server, 🔌 Relay, 🅼 MobX, 🌳 Koa, 🅴 Express js, 📈 GraphQL, 😎 Swagger, 💨 Tailwind, 🦸 HeroUI, 🦅 SwiftUI, 💾 SwiftData, ☁️ CloudKit, ⏰ AlarmKit, 🧩 WidgetKit, 🎥 Lottie Files, 🥤 Cocoa Touch, 🥥 Cocos2D, 🅻 Laravel, 🎵 Symfony, 🆈 YII and YII2, 🔥 CodeIgnitor, 🆉 Zend Framework, 📍 CoreLocation, 🎥 CoreAnimation, 🏠 Apple HomeKit, ❤️ Apple HealthKit, 💰 Superwall, 💳 Stripe, ☎️ Twilio. Databases: 🍃 Mongo, 🐬 MySQL, 🪶 SQLite, 🍉 Watermelon DB, ⚡️ Supabase, 🔥 Firebase, 🐘 Postgres, 📄 TypeORM, ➡️ Doctrine, ⚪ DynamoDB/PartiQL, 🔴 Oracle, 🅲 CoreData, 🟣 Realm. I design the schemas too — relational and NoSQL, with indexing and query performance in mind. Cloud Computing: 🔺 AWS (Lambda, DynamoDB, SQS, EventBridge, S3, CloudFront, EC2), 🌥️ Google Cloud Platform, 🐳 Docker, ☸️ Kubernetes, ☸️ Google Kubernetes Engine, 🌊 DigitalOcean, 🅷 Heroku, 🆁 Render, ☀️ Netlify, ▲ Vercel, 🟠 Cloudflare, 🅰 Microsoft Azure. Serverless and edge functions, plus deployment and hosting on about half my projects. I have developed over 20 iOS apps, 15 React Native apps, several Android apps, APIs for some of them, over 20 websites, and shipped my own products to the App Store. I'm proficient in problem-solving, with a solid track record of fixing complex problems teams had struggled with on their own — usually performance issues or hard-to-track bugs. How I work: ⚡ I reply fast and I'm easy to reach — quick responses are what clients mention most. 🕒 Based in Europe: in sync with European clients, day shifted later for US ones, and I've worked across Asian time zones too. 🎯 I work autonomously: give me the goal and I'll plan it, ask what actually matters, and keep you posted. 💡 I don't just execute tickets — I treat your project as my own and tell you when I see a better way. 🧵 I've worked in around 15 teams, and can also deliver an app, API or server entirely on my own, turnkey. Languages: English C1, Polish B1, Russian and Belarusian native. I like to explore new technologies and build software of any complexity. I follow best practices, test thoroughly, and write clean, readable code any other developer can maintain.

"Need an engineer who can turn an idea into a polished mobile and web product without costly rewrites? I'm Yevhen, a Mobile App Developer & Frontend Developer with 6+ years of experience in React Native and 15+ production-ready digital projects. I build mobile apps, web frontends, and cross-platform products from idea to launch. My focus is faster delivery, pixel-perfect UI, and scalability. 💻 What I build as a Mobile App Developer | Frontend Developer 15+ mobile apps, MVPs, dashboards and frontend solutions. 6+ years designing scalable mobile and web interfaces. 30-60% less manual work through reusable component systems and automation. 2 platforms covered with React Native and Expo: iOS and Android. 3 product layers managed: mobile, frontend, architecture. 4 stages covered: planning, development, launch, scaling. I work as a mobile app developer with React Native, Expo, TypeScript, React, Next.js, Redux, Tailwind CSS and Styled Components. For Expo product, I provide mobile app developer expertise with OTA updates and EAS build. For React systems, I work as a frontend developer using component architecture and state management. I can also join as a web developer, mobile developer, frontend developer, or React Native engineer. 📱 Mobile app development I create React Native applications for iOS and Android from a single codebase. Each mobile app can include navigation, offline support, push notifications, and API integration. ✔️ 15+ apps shipped - React Native and Expo for iOS and Android ✔️ 2 platforms from 1 codebase - Cross-platform mobile development ✔️ 100% pixel-perfect UI - Figma to React Native component translation ✔️ OTA updates - Expo Application Services for instant deployments ✔️ Offline-first architecture - Local storage and sync strategies ✔️ Push notifications - Firebase Cloud Messaging and APNs ✔️ Native module integration - Camera, geolocation, biometrics, BLE ✔️ Deep linking & navigation - React Navigation and URL-based routing ✔️ App Store & Google Play - Full release and review process ✔️ 60+ FPS animations - Reanimated and gesture-based interactions ✔️ Accessibility - Screen reader support and WCAG-compliant components As a mobile app developer, I build workflows that connect APIs, handle authentication, and deliver smooth user experiences across devices. A second mobile layer can integrate native features when required. My React Native pipelines adapt when platform updates change. 🎨 Frontend, UI/UX. Web development As a Frontend Developer, I build responsive web applications, dashboards, and design systems. I can work as a Frontend Developer specialist, connecting interfaces, state management, API layers, and component libraries through React and Next.js. For data-heavy systems, I apply performance optimization methods and coordinate with a designer when needed. I assess whether TypeScript techniques are justified or simpler logic is safer. I also support mobile-first responsive workflows involving layouts, animations, and accessibility. ⚙️ Core stack and approach ✔️React Native, Expo, TypeScript, JavaScript, React, Next.js, Redux Toolkit ✔️REST API, GraphQL, Firebase, AsyncStorage, SQLite, and EAS deployment ✔️Payment gateway integration, authentication, third-party APIs and mobile automation ✔️Architecture, coding, testing, documentation and production support I can begin as an it consultant, clarify the scope, then continue as the Mobile App Developer responsible for implementation. Depending on the system, I may work as a mobile app developer, provide frontend developer delivery, or take ownership as a Frontend Developer during restructuring and scaling. For legacy environments involving older React codebaKeywords: Full-stack developer, Web development, Mobile app development, API development, Backend development, Frontend development, SaaS development, Startup development, MVP development, Product development, System architecture, Platform development, Next.js developer, React developer, JavaScript, TypeScript, HTML5, CSS3, Responsive design, React Native developer, Expo, Cross-platform apps, iOS development, Android development, Python developer, FastAPI, Django, Flask, REST APIs, Automation engineer, Process automation, Business automation, Workflow automation, ETL pipelines, Data processing, Web scraping, Scrapy, Selenium, Playwright, AI integration, ChatGPT integration, Analytics dashboards, Admin dashboards, Internal tools, CRM systems, Performance optimization, Scalability, Cloud-ready systems, CI/CD, Digital platforms, AI-powered applications, Responsive web design, Web app development, Landing page development, Python automation, Data scraping, Cross-platform mobile apps, Mobile UI development, Python Backend Developer, RestAPI, Rest API, Fast API, PostgreSQL, SQL, Postgres, Scrapping, Data Extraction, Bots, Scripts, React.js, ReactJS, React Js, NextJS, Next Js, Full Stack, FullStack, ReactNative, Mobile App, LLM, RAG, AI Agent, LangChain, Data Pipeline, bot.