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Senior iOS / iPadOS / watchOS / tvOS / macOS Developer — 7 years, 15+ shipped apps, 1M+ users reached. I build native Apple apps end to end: idea → architecture → UI → App Store → post-launch iteration. Swift & SwiftUI first, clean architecture, and no shortcuts that cost you later. ✅ PROVEN RESULTS ⭐️ Shipped and maintained an app with 1,000,000+ users (core team of 3). ⭐️ Kept a 150,000-user app at 99.96% crash-free (team of 2). ⭐️ Led products from idea → design → refinement → implementation → release. ⭐️ 15+ delivered projects across iPhone, iPad, Apple Watch, Apple TV and Mac. ⭐️ Built my own apps: a spaced-repetition learning app (Ebbinghaus forgetting curve) and an enhanced music player. 🎯 WHAT I CAN DO FOR YOU ▸ Build a new iOS app from scratch — MVP in weeks, not quarters ▸ Rescue or refactor a legacy Objective-C / messy Swift codebase ▸ Kill crashes, memory leaks, slow launch time and laggy scrolling ▸ Get you through App Store review (rejections, privacy, ATT, guidelines) ▸ Add monetization: subscriptions, in-app purchases, paywalls, ads ▸ Port an iPhone app to iPad, Apple Watch, Apple TV, CarPlay or macOS ▸ Take over an abandoned project and actually ship it 🛠 TECH STACK 🟢 Languages: Swift, Objective-C, Python (basic) 🟢 UI: SwiftUI, UIKit, AutoLayout, SnapKit, Core Animation, WidgetKit, Live Activities, App Clips, Dark Mode, Accessibility / VoiceOver, Localization 🟢 Architecture: MVVM+C, VIPER, TCA, MVC, Clean Architecture, SOLID, Facade, Adapter, Decorator, Factory Method, Singleton, Builder, Observer, Command 🟢 Concurrency: Swift Concurrency (async/await, actors), GCD, OperationQueue 🟢 Reactive: Combine, RxSwift, ReactiveSwift, ReactiveCocoa 🟢 Networking: REST API, URLSession, Alamofire, Moya, AFNetworking, GraphQL (Apollo), WebSockets, Socket IO 🟢 Data: Core Data, Realm, SQLite, SwiftData, CloudKit, Keychain, Firebase Cloud Firestore, Firebase Realtime Database 🟢 Apple frameworks: Foundation, MapKit, Core Location, AVFoundation, AVKit, HealthKit, StoreKit 2, PassKit, EventKit, HomeKit, SiriKit, App Intents, PushKit, WatchKit, TVMLKit, WebKit, SpriteKit, Core Bluetooth, Core Motion, Core ML, Vision, Speech, Contacts, CarPlay 🟢 Services & SDKs: Firebase (Analytics, Crashlytics, Remote Config, Dynamic Links), OpenAI API, Stripe, Apple Pay, Twilio API, Google Maps, Google Places, Google AdMob, Facebook SDK, Sign in with Apple, Amplitude, Mixpanel, Sentry, RevenueCat, OneSignal 🟢 Quality & CI/CD: XCTest, unit & UI testing, Fastlane, Xcode Cloud, GitHub Actions, Bitrise, SwiftLint, Xcode Instruments, TestFlight, App Store Connect, code review 🟢 Tools: Xcode, Git, GitHub, Sourcetree, SPM, CocoaPods, Carthage, Figma, Sketch, Zeplin, Postman, Proxyman 🟢 Process: Agile, Scrum, Kanban, JIRA, Trello, ClickUp 💡 FEATURES I'VE SHIPPED In-App Purchases & subscriptions · Payment Gateway Integration · Push Notifications · User Authentication & User Profile Creation · Chat & Messaging · Map Integration & Location-Based Services · Bluetooth / BLE · Camera & Photo · Microphone & Audio · QR & Barcode Scanner · Offline Functionality & Sync · Deep Links & Universal Links · Social Media Account Integration · In-App Search · AI Text-to-Speech · Face Detection · Motion Sensors · Advanced Analytics & A/B Testing · In-App Advertising · Review & Feedback Collection · Application Security · API Integration · In-App Support 📦 SERVICES Native App Development · Mobile App Development · Mobile App Redesign · Mobile App Improvement · Mobile App Bug Fix · Mobile App Testing · Mobile App Localization · App Store Optimization · Mobile App Development Consultation · iPhone & iPad Apps · Apple Watch Application · Apple TV Application · macOS Application 🤝 HOW I WORK ✔️ Clear English, regular updates, no disappearing acts. ✔️ Your timezone matters — I overlap with both US and EU hours. ✔️ Estimates you can plan around, and a heads-up the moment something changes. ✔️ Clean, documented, testable code that you or your next developer can own. ✔️ NDA-friendly — your idea stays yours. Thanks for reading this far 🙂 Tell me what you're building, and I'll reply with an honest estimate plus the first thing I'd fix

I help startups and businesses build AI-powered SaaS platforms, marketplaces, and automation systems that reduce manual work and scale operations fast. I deliver production-ready web and mobile applications by combining 8+ years of hands-on development experience with modern AI tools like Claude and Cursor—shipping faster without compromising code quality, architecture, or UX. I also specialize in transforming outdated web apps into modern, AI-driven platforms with clean, maintainable architecture, so you're not locked into a developer for every small change. If you're looking for someone who understands both technology AND business outcomes, you're in the right place. 🚀 Core Expertise - AI-powered SaaS platforms & MVPs - AI Voice Agents (Twilio, PBX, ElevenLabs TTS, Deepgram STT, RAG pipelines) - Retrieval-Augmented Generation (RAG) & Vector Databases (Pinecone, Weaviate, pgvector) - Healthcare platforms — HIPAA, EHR, EMR, PHI, RHIR, Epic integrations - Legal tech platforms — iManage, DocuSign, matter management, intake workflows, document management - Sports industry platforms — live scoring, fantasy, scheduling, fan engagement - Marketplace development (buyer/seller/admin systems) - Business process automation - Scalable backend architecture - Custom dashboards & admin panels 🧠 How I Help You Whether you're launching an MVP or scaling an existing product, I can help you: ✅ Build your SaaS product from scratch ✅ Develop AI voice agents and conversational AI systems ✅ Implement RAG pipelines with vector database search ✅ Build HIPAA-compliant healthcare and EHR-integrated platforms ✅ Develop legal tech tools with matter management and document automation ✅ Automate repetitive workflows using AI ✅ Create seamless web & mobile applications ✅ Improve performance and reduce operational costs ⚙️ Tech Stack - Mobile Application Development: Flutter / Dart, React Native CLI / Expo, Redux — cross-platform iOS & Android. PWA (React.js). - Front-End Development: TypeScript, React.js, Next.js, Remix, Vite, Vue.js, Nuxt.js, Tailwind CSS - Back-End Development: Python (Django / Flask / FastAPI), Node.js (TypeScript), Express.js, NestJS, Fastify, Strapi - AI & Voice Stack: OpenAI, Claude (Anthropic), LangChain, LlamaIndex, Pinecone, Weaviate, pgvector, Twilio (Voice / SMS), ElevenLabs (TTS), Deepgram (STT), PBX / SIP integrations, RAG pipelines - Database: PostgreSQL, MongoDB, MySQL, SQLite, Amazon Redshift, MariaDB, DynamoDB - Tools & Infrastructure: GitHub, Bitbucket, Firebase, WebSocket, Redis, Nginx, AWS (EC2, S3, RDS, EBS), Docker My experience spans various domains, as outlined below: 1. HIPAA-compliant SaaS platform for hospital care and home care companies: web application and mobile application (iOS & Android) with PHI data handling, EHR/EMR integrations, RHIR-compliant data flows, and Epic API connectivity. 2. Matter management and client intake platform for law firms: web application integrating iManage for document management, DocuSign for e-signatures, and a custom intake workflow engine. 3. AI voice agent for customer support automation: built end-to-end with Twilio for telephony, Deepgram for real-time STT, ElevenLabs for natural TTS, and a RAG pipeline backed by a vector database for context-aware responses. 4. RAG-powered enterprise knowledge base: ingested internal documents into a Pinecone / Weaviate vector store and built a semantic search and Q&A interface using LangChain and OpenAI. 5. Sports league and tournament management platform: web and mobile application for scheduling fixtures, managing brackets, tracking live scores, and publishing standings in real time. 6. AI-powered SaaS platforms and MVPs: built using Claude AI, Cursor AI, Lovable, and Replit — rapidly shipping production-ready products with AI-augmented development workflows. 7. Asset management system: web application and mobile applications for iOS and Android. 8. Revenue management system: pulls data from QuickBooks, Mercury API, and Stripe API to calculate and report revenue. 9. Marketplace platform for car and bike parts / equipment: vendor-buyer concept with product listings, order management, and admin panel. 10. Retreat and hotel booking engine, ticket booking system with live seat selection, and courses booking system: web and mobile applications with scheduling and payment gateway integrations. 11. Food delivery and grocery delivery mobile applications: iOS and Android, built with Flutter and React Native. 12. Real estate website with MLS Grid integration, job board, classified listings, and dating platform: full-stack web and mobile applications across various consumer verticals. 🤝 Let's Work Together If you're looking for: - A reliable long-term developer - Someone who understands business, not just code - Fast execution with scalable, future-proof architecture 👉 Send a message or invite me to your job.

Experienced iOS Developer | 9+ Years of Expertise in Building High-Quality Mobile Apps 🚀 Transforming Ideas into Top-Rated Mobile Applications With over 9 years of experience in iOS development, I specialize in bringing innovative app ideas to life. My extensive background covers the entire Apple ecosystem, including iPhone, iPad, and Apple Watch, allowing me to create seamless and powerful experiences across all devices. 🛠 Technical Mastery in Swift Armed with deep expertise in Swift I deliver cutting-edge solutions tailored to your unique needs. My skill set extends to advanced frameworks like SwiftUI, Core Data, Combine, and third-party libraries, ensuring that your app is built using the best practices in mobile development. 📱 Proven Track Record on the App Store I've successfully launched over 20 apps on the App Store, showcasing sleek interfaces, seamless web service integrations, and engaging multimedia content. This rich portfolio reflects my ability to manage projects end-to-end, from ideation to deployment, with a strong focus on performance and user experience. 💡 Unique Perspective as an App Entrepreneur Beyond coding, I bring the valuable insights of an app entrepreneur. Having conceived, developed, and marketed my own apps, I understand the full development lifecycle, from MVP creation to scaling and user acquisition. This entrepreneurial mindset ensures that I not only build functional apps but also design them for market success. 🔍 Comprehensive Expertise in iOS Ecosystem UI/UX Design: Creating intuitive interfaces that delight users. App Store Optimization (ASO): Enhancing visibility and downloads. Cloud Integration: Utilizing services like Firebase and AWS for scalable backends. Third-Party Integrations: Expertise in payment gateways, social media APIs, and analytics. 💬 Let's Collaborate to Elevate Your Project I’m passionate about helping businesses and entrepreneurs achieve their mobile app goals. Whether you need a complete app build, app enhancements, or expert consultation, I’m here to provide the support and solutions you need. Ready to bring your iOS app idea to life? Send me a message, and let’s discuss how we can turn your vision into a top-ranking app on the App Store.

I am a physicist and a software developer in the C family of programming languages. I mostly do native iOS (Swift/Objective-C) and cross-platform C++ programming and can handle some JavaScript. I am also interested in anything physics-related: would be glad to put my degree to work. See below for more details. I started working in professional software development in 2007. In the same year I received a master's degree in nuclear and elementary particles physics from Taras Shevchenko Kyiv University, so I have a strong mathematical background. You can find a link to my arXiv page in the 'Other experiences' section of my profile. I programmed iOS and Mac applications most of the time but had a chance to familiarize myself with front- and back-end web development as well. I am also proficient in modern C++. Here are some rare skills of mine that may interest you: - hybrid (native + JS) iOS applications; - XMPP (Jabber) protocol; - back-end web development in C++; - physical processes modelling, discrete element method modeling pf many-particle dynamics in particular.

$𝟑𝟎𝐊+ 𝐢𝐧 𝐂𝐥𝐢𝐞𝐧𝐭 𝐑𝐞𝐯𝐞𝐧𝐮𝐞 | 𝟑𝟎+ 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 | 𝟏𝟎𝟎% 𝐂𝐥𝐢𝐞𝐧𝐭 𝐒𝐚𝐭𝐢𝐬𝐟𝐚𝐜𝐭𝐢𝐨𝐧 My goal is simple - your mobile app should be stable, scalable, and valuable for your business. I’m Olha, a Mobile App Developer specializing in native iOS and Android development with Swift, SwiftUI, Kotlin, and Java. I help startups, SaaS companies, healthcare products, fintech platforms, logistics businesses, streaming services, and enterprise teams build mobile applications that are ready for real users. Whether you need an MVP, a new mobile app from scratch, improvements to an existing iOS or Android app, or long-term mobile development support I can help you move from idea to launch with clean native development. ✔️ Mobile App Developer — full-cycle mobile app development from idea, architecture, and development to App Store and Google Play release. ✔️ iOS Developer — native iOS apps built with Swift, SwiftUI, Objective-C, Apple frameworks, and scalable architecture. ✔️ Android Developer — native Android apps built with Kotlin, Java, Android Studio, Google SDKs, and clean maintainable code. ✔️ Native iOS & Android Development — stable, fast, and user-friendly mobile apps without unnecessary cross-platform complexity. ✔️ Long-Term Mobile Development Partner — support, maintenance, new features, performance optimization, and product scaling after launch. 🔥 ACHIEVEMENTS ✔️ 8+ years of experience as a Mobile App Developer building native iOS and Android applications across multiple industries. ✔️ 30+ mobile app development projects delivered for startups, SaaS, healthcare, fintech, logistics, streaming, wellness, and enterprise products. ✔️ $30K+ in client revenue supported through mobile app development, product improvements, and long-term development cooperation. ✔️ Native mobile apps built for products with 2M+ downloads, 500K+ users, and high daily engagement. ✔️ iOS and Android applications delivered for logistics platforms operating across 60+ cities. ✔️ Mobile app development for AI-powered platforms, fintech products, wearable apps, booking systems, delivery apps, and streaming solutions. ✔️ Strong experience improving existing iOS and Android apps through performance optimization, UI/UX improvements, bug fixing, and feature development. 🚚 WHERE I DELIVER ✔️ As a Mobile App Developer — I build mobile applications from MVP to production-ready product, including architecture, development, integrations, testing, deployment, and maintenance. ✔️ As an iOS Developer — I deliver native iOS apps for iPhone, iPad, Apple Watch, and Apple ecosystem products using Swift, SwiftUI, and Objective-C. ✔️ As an Android Developer — I deliver native Android apps for smartphones, tablets, WearOS devices, and Android-based ecosystems using Kotlin and Java. ✔️ As a Native Mobile App Developer — I work with Firebase, AWS, REST APIs, GraphQL, push notifications, subscriptions, analytics, payments, and real-time features. ✔️ As a long-term development partner — I help improve existing mobile apps, reduce technical debt, optimize performance, and add new features without breaking the product. 🏆 INDUSTRY IMPACT ✔️ Healthcare & Wellness Apps — native iOS and Android development for wellness platforms, healthcare tools, wearable integrations, biometric data, and user activity tracking. ✔️ Fintech Mobile Apps — secure payment flows, Stripe and PayPal integrations, Apple Wallet features, subscription systems, and financial dashboards. ✔️ Logistics & GPS Apps — GPS tracking, geofencing, delivery tracking, real-time location updates, driver apps, and logistics management tools. ✔️ Streaming & IPTV Apps — IPTV applications, OTT platforms, FireTV apps, video playback optimization, and low-latency streaming features. ✔️ Wearables & IoT Apps — Apple Watch, WearOS, BLE devices, IoT sensors, smart devices, and biometric integrations. ✔️ AI-Powered Mobile Apps — AI productivity apps, AI wellness platforms, LLM integrations, real-time analytics, and AI-powered user experiences. ✔️ Booking, Delivery & Marketplace Apps — mobile products with user profiles, payments, notifications, dashboards, real-time updates, and scalable app architecture. ⚒️ HOW I BUILD ✔️ iOS Development: Swift, SwiftUI, Objective-C, Xcode, Apple frameworks, Apple Watch, Apple Wallet, App Store deployment. ✔️ Android Development: Kotlin, Java, Android Studio, Google SDKs, WearOS, Google Play deployment, Android architecture. ✔️ Mobile App Development Stack: Firebase, AWS, REST APIs, GraphQL, push notifications, subscriptions, payments, analytics, dashboards, real-time tracking. ✔️ Product Development: MVP development, startup mobile app development, enterprise mobile apps, UI/UX optimization, performance improvements, feature development. ✔️ Architecture & Workflow: clean architecture, scalable codebase, CI/CD, Agile workflow, code review, app maintenance, long-term support.

🤝 Let's build an app - stable, fast, intuitive. I'm an iOS Developer and Swift iOS Developer who builds products people enjoy and businesses can scale. 📊 Shipped as iOS Developer and Swift iOS Developer: – 15 iOS apps as iOS Developer: marketplace, booking, logistics, e-commerce, in-app purchases - full-cycle iOS Development to App Store – 5 Flutter apps as flutter developer and full stack mobile developer: Firebase integration - 40%+ faster time-to-market vs native-only – 4 IoT and connected-device apps as Swift iOS Developer: iot development, BLE, real-time sensor data - production iOS Development for hardware-software products – 8 API integration projects as iOS Developer: user authentication, push notifications - crash rates below 0.5% through structured iOS Development – 3 ios game developer projects: SwiftUI-driven UX, in-app subscriptions - 25%+ user retention improvement through swift ios development As a Swift iOS Developer with 8+ years in iOS Development, I deliver full-cycle ios mobile app development for startups, SaaS and growing businesses. As an iOS Developer and mobile app developer Ukraine, I build production-ready, scalable apps through modern ios development practices. 💡 Tech of an iOS Developer and flutter developer As a swift mobile developer and ios developer ai, I provide: 🔸 Swift iOS Developer lifecycle: swift ios development, ios application development 🔸 API Integration (RESTful APIs, JSON), Firebase, SQL 🔸 User Authentication, push notifications, background services 🔸 Performance optimization, CI/CD, App Store deployment 🔸 SwiftUI, UIKit, Objective-C, Apple Xcode - my daily iOS Development core As a senior iOS Developer, my approach to iOS Development ensures clean MVVM/Clean Architecture, performance and intuitive mobile app design. I also bring ai chatbot developer experience integrating conversational features, and as a flutter developer I collaborate on Dart / Flutter stacks, figma mobile app handoffs and bubble io certified developer mobile app workflows. 🧩 Cross-Platform Beyond native iOS Development, I work as a flutter developer and mobile application developer. I collaborate with more than one flutter developer team and contribute to react native and android developer workflows - coordinating ios development with android development teams. My experience as a Mobile Developer and flutter developer covers mobile app design, full stack developer integration, web developer collaboration and iot development use cases for connected devices. I work as a Mobile App Developer and mobile application developer on Mobile App Development pipelines, integrating backend APIs, databases and Firebase. I also contribute as ai mobile app developer on select projects - with ai chatbot developer features - though core focus stays iOS Development and swift ios development. As a flutter developer, Mobile Developer and iOS Developer, I support mobile app marketing with App Store optimization input and full stack mobile developer coordination across every Mobile App Development project - from ios mobile app development discovery through launch. 🔑 Stack: Swift, SwiftUI, UIKit, Objective-C, Xcode, Firebase, Dart, Node.js, Flutter, react native, Git, SQL, Python, ios application development, iot development, ios game developer, ai chatbot developer ios application development, bubble io certified developer mobile app, figma mobile app, full stack developer, web developer, mobile app marketing, mobile app developer ukraine, ai mobile app developer, swift mobile developer, android developer, android development, blockchain development, data entry, uxpin, ios developer ai, iot development. If you need a dependable iOS Developer or Swift iOS Developer for ios development - I'm ready as a Swift iOS Developer, flutter developer, Mobile Developer and Mobile App Developer who treats every iOS Development and Mobile App Development milestone with the same care.