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I’m a senior iOS developer with 7+ years of experience building, auditing, and scaling iOS apps—from aviation tools for pilots to fintech, healthcare, and green-tech platforms. I specialize in Swift, SwiftUI, and modern iOS architectures (MVVM, VIPER, Combine), and have a track record of delivering fast, secure, and App Store-ready apps. I can help you: • Build new iOS apps from scratch using Swift & SwiftUI • Audit and improve app performance, UI/UX, or architecture • Debug critical issues and optimize code quality • Consult on design and strategy before or during development Recent highlights: • Improved load times by 30% for Duolingo through code refactoring • Developed a flight navigation app used by pilots for Lufthansa Systems • Built green mobility app “iRiide” with Firebase backend and custom dashboard • Secured 10,000+ downloads for a cryptographic app with custom encryption You’ll get: ✔ Clear, timely communication (English fluency, async-friendly) ✔ Clean, maintainable code with testing and documentation ✔ Experience across time zones and fully remote workflows Let’s build something exceptional together—or make what you already have even better.

Job Title/Positions: iOS Team/Tech Lead, Senior iOS/Mac OS Developer, C/C++ software developer, C/C++ 2D game developer Summary of Skills * Experience in development using languages: Swift, Objective C, C/C++, Ruby, Java, Kotlin * Experience in development using frameworks: SwiftUI, Combine, Cocoa, Foundation, UIKit, RxSwift and other related reactive libraries, CoreData, GCD, OCUnit, cocos2d, OCMock, CocoaPods, SpriteKit, Android SDK, Rails * Experience in development using methodologies: Waterfall, TDD (writing both unit testing and automated UI testing), Scrum. * Experience in TCA and pattern oriented software development Miscellaneous * My primary goal is to get things done with acceptable quality. * I like to solve challenging tasks, especially tasks, which need to do some research. * I like to help team members in solving their tasks with minimum effort. * I like to work smarter, not harder. * I have the ability to learn new technologies quickly and work in a fast paced environment.

I am an experienced and motivated strong senior iOS developer, interested in skillfully creating creative mobile applications and utilities. I understand the importance of creating easy-to-read, reusable, and easily maintained source code. I constantly strive to learn new technologies and look for ways to improve myself in this rapidly changing industry. My strengths and skills: - 7 years of iOS development - Degree in Computer Science - Experience developer native iOS application - Knowledge of APIs and design patterns (MVC, MVP etc) - Push notifications - REST API development skills - Experience MapKit, MapBox - Stripe - Firebase - Firestore - Crashlytics - In-App purchases - etc

Hello! I'm an AI engineer, full-stack iOS/Android/PHP/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 ship my own apps end to end, alone, from idea to the App Store, and keep them 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 prints WiFi QR cards at exact DPI. Both 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, 🐆 Fastify, 🥤 Fresh, 🅰 Apollo GraphQL Client and Server, 🔌 Relay, 🅼 MobX, 🌳 Koa, 🅴 Express js, 📈 GraphQL, 😎 Swagger, 💨 Tailwind, 🦅 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, 🇷🇺 Russian and 🇧🇾 Belarusian native, 🇵🇱 Polish B1. 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.

I help startups and product teams build, fix, improve, and release iOS apps — from first prototype to App Store release. I specialize in Swift, SwiftUI, UIKit, StoreKit, subscriptions, Firebase, and maintaining existing iOS codebases. I have 8+ years of commercial iOS experience and have worked on 15+ apps, including VPN apps, utility apps, AI apps, ad blockers, and subscription-based products. What I can help with: • Build iOS apps from scratch • Improve or maintain existing iOS apps • Fix crashes, bugs, and performance issues • Add subscriptions and in-app purchases • Integrate Firebase, AppsFlyer, Adapty, RevenueCat, or other SDKs • Prepare and release apps to the App Store • Migrate Objective-C code to Swift • Improve architecture and clean up legacy code My main stack: Swift, SwiftUI, UIKit, Objective-C, StoreKit 2, Firebase, REST API, Push Notifications, App Store Connect, Xcode, Combine, Core Data. I am comfortable taking ownership of features, working with existing codebases, and communicating clearly during the project. If you need a reliable iOS developer who can not only write code, but also help you ship and improve your product, I can help.

📱 With a robust background as an iOS developer since 2010 and an Android developer since 2015, I specialize in developing versatile, enduring, and reliable mobile application solutions tailored for the Digital Goods market, with a particular focus on 📖 e-books and 🎧 audiobooks. Additionally, I have extensive experience crafting solutions for various industries including Productivity, Shopping, Education, and Medical sectors. I prioritize proficient project and resource management to ensure timely delivery and adherence to budgetary constraints ⏰💰. 🔄 A meticulously devised software development strategy is crucial for the success of any product. When collaborating with clients, I design and implement processes that promote efficient and seamless teamwork, both internally and in client-facing interactions. I advocate for an agile approach to software development and actively solicit client feedback throughout the project lifecycle. 📈 I am convinced that this structured approach is pivotal for the timely and effective execution of products that align with client objectives. This methodology has empowered me to assist clients in developing applications for diverse platforms, tailoring solutions to meet specific market demands and client needs. ✅ In addition to proficient coding skills, I highly value responsibility, responsiveness, and reliability. These qualities are what I guarantee to my future clients and appreciate in my existing clients. I am seeking long-term projects where I can take full responsibility for my work and have the commitment to maintain the solutions I build over time. 📱𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐚𝐧𝐝 𝐓𝐨𝐨𝐥𝐬 🛠️ 🧑‍💻 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 • Objective-C • Swift • Kotlin • Java • Flutter • React Native • SQL • Python • Ruby • AppleScript 📦 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 & 𝐀𝐏𝐈𝐬 & 𝐦𝐨𝐫𝐞 • UIKit • AVKit • SwiftUI • SwiftData • Core Data • Core Location • Store Kit • Android Jetpack • DI (Hilt) • Navigation • Compose • Room • Coroutines • LiveData • Flow • Social APIs • REST • App Extensions • MVI • MVVM (Data-Binding) • Design Patterns • Clean Architecture • Digital Rights Management (DRM) 🔧 𝐒𝐃𝐊𝐬 & 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐓𝐨𝐨𝐥𝐬 • xCode • Android Studio • Build Scripts • PSPDFKit • Colibrio Reader • Readium LCP 📂 𝐒𝐨𝐮𝐫𝐜𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 • Git 🎵📄 𝐌𝐞𝐝𝐢𝐚 & 𝐅𝐢𝐥𝐞 𝐅𝐨𝐫𝐦𝐚𝐭𝐬 • ePub • ePub3 • PDF • HLS • MP3 📞 If you are looking for reliable resources and planning for a long-term, enjoyable journey for your existing or future mobile application, don't hesitate to schedule an introductory call with me. I can share my expertise in detail. Let's take your business to the next level with modern mobile solutions. 🚀