I build complete apps in Kotlin—from Android UIs with Jetpack Compose to backends with Ktor and deployment on Linux VPS. One developer, one language, the entire stack. My focus: Android (Jetpack Compose, MVVM, Room), Kotlin Multiplatform for iOS/Android, backend (Ktor, REST, PostgreSQL), infrastructure (Docker, Nginx, VPS). I take on a limited number of projects to ensure quality. Currently finishing my B.Sc. in Computer Science. You need someone who delivers and keeps things running? Let’s talk

Experienced Android developer with over 4 years of experience and a portfolio spanning 200+ diverse projects. Whether it's a short-term task or a long-term project, I'm here to turn your ideas into high-quality native Android apps using Kotlin and Java. I prioritize customer satisfaction and success above all else. My approach involves creating modern UIs with clean and commented code. If you're seeking a successful product, I invite you to reach out to me. Let's discuss now!

Thanks for visiting my profile! 👋 I’m a Senior Mobile Engineer with 5+ years of experience building high-quality mobile applications using Android Native and Kotlin Multiplatform (KMP). I help startups and businesses build scalable, maintainable, and high-performance mobile apps for both Android and iOS using a shared Kotlin codebase. My focus is on clean architecture, modern development practices, and delivering reliable products that create real value for users. I believe that successful software comes from clear communication, honesty, clean code, and attention to detail — values I bring to every project. What I Can Help You With : Mobile Development - Android App Development (Native Android) - Kotlin Multiplatform (KMP) Development - Shared business logic for Android & iOS - Jetpack Compose UI Development - REST API & GraphQL Integration - Firebase Integration - Google Maps & Location Services - E-commerce & Delivery Applications - Performance Optimization & Bug Fixing - App Refactoring & Code Reviews - Publishing Apps to Google Play and App Store Languages & Frameworks - Kotlin - Java - Kotlin Multiplatform (KMP) - Jetpack Compose - Android SDK - XML Architecture & Engineering - MVVM, MVI, MVP, MVC - Clean Architecture - SOLID Principles - Design Patterns - Modularization - Dependency Injection (Hilt, Dagger, Koin) Async & Networking Kotlin Coroutines - Flow - RxJava - Retrofit - REST APIs - GraphQL APIs - Protocol Buffers Tools & Platforms - Android Studio, Xcode - Firebase, Supabase - GitHub, GitLab, Bitbucket - Jira, Trello, Asana, Slack - Figma, Adobe XD Testing - Unit Testing - Instrumented Testing I’m always focused on writing clean, maintainable, and scalable code while building long-term relationships with clients through quality work and reliability. Let’s build something great together 🚀

AVAILABLE NOW - I can start working on your Android app today I’m an Android developer with 3+ years of real-world experience building and maintaining native Android apps that are clean, stable, and easy to use. I work fast, communicate clearly, and take responsibility for the code I write. If something breaks, I fix it. If something can be done better, I’ll tell you. What I handle on Android projects ✅ Native Android app development – idea → UI → logic → testing ✅ Clean architecture – MVVM, readable and maintainable code ✅ Modern Android tools – Kotlin, Jetpack Compose, XML ✅ Bug fixes & app improvements – crashes, UI issues, performance problems ✅ API integration – REST APIs, Firebase, data handling What you can expect • Clear communication and regular updates • On-time delivery • Clean, reviewed code • No disappearing mid-project Tech I use daily Kotlin • Java • Jetpack Compose • XML • MVVM • Android SDK • Firebase • REST APIs • Git If you need a developer who gets the job done without overcomplicating things, I’m ready to help. Send me a message and let’s talk about your Android app.

I specialize in Kotlin/Java development with a strong focus on Android and Kotlin Multiplatform (KMP). I build scalable, maintainable, and high-performance applications using modern architectures and best practices. Key Skills & Expertise: - UI Development: Jetpack Compose, Custom Views - Architectures: Clean Architecture, MVVM, MVP, MVC, MVI - Dependency Injection: Dagger 2, Hilt - Networking: REST APIs (JSON, XML, Retrofit/OkHttp) - Social Media Integration: Facebook, Google - In-App Monetization: In-App Billing, Google AdMob - Database Management: SQLite, Room Database - Asynchronous Programming: Coroutines/Flow, RxJava2 - Multiplatform Development: Kotlin Multiplatform (KMP) - Multimedia & Media Player Integration - Version Control: Git - Other Tools & Libraries: A wide range of libraries to optimize app performance 🚀 Let’s Build Something Great! I’m open to discussing your project to see how my skills can bring your ideas to life. Contact me, and let’s make your app a success!

Senior Android Engineer with 9+ years of experience building, scaling, and maintaining high-quality Android applications used by thousands to millions of users worldwide. I help startups, businesses, and product teams develop Android apps that are reliable, scalable, and built for long-term growth. Whether you need a new application, help modernizing an existing codebase, performance improvements, AI-powered features, or urgent production fixes, I can jump in and deliver results quickly. Over the years, I have worked on large-scale production applications across media streaming, audio technology, advertising monetization, analytics, subscriptions, and real-time user experiences. My experience spans the entire Android development lifecycle—from architecture and implementation to CI/CD automation, release management, and ongoing maintenance. What I Can Help You With ✅ Native Android Development (Kotlin & Java) ✅ Jetpack Compose & Modern Android Architecture ✅ MVVM, Clean Architecture & Modularization ✅ Bug Fixing, Crash Resolution & Technical Debt Reduction ✅ Legacy App Modernization ✅ REST API & WebSocket Integration ✅ Media Streaming Apps (ExoPlayer, Audio, Video & DRM) ✅ AI-Powered Features & LLM Integrations ✅ Firebase & Real-Time Data Synchronization ✅ Room Database & Offline-First Applications ✅ Google Play Billing & Subscription Systems ✅ Push Notifications (FCM) ✅ Ad Monetization (AdMob, Appodeal, Meta, Instreamatic & More) ✅ CI/CD Automation (GitLab CI, GitHub Actions & Fastlane) ✅ Google Play Store Deployment & Release Management Why Clients Work With Me ✔ 9+ years of professional Android development experience ✔ Strong experience working on production applications with large user bases ✔ Fast onboarding into existing codebases ✔ Clean, maintainable, and scalable code ✔ Clear communication and proactive problem-solving ✔ Reliable delivery and long-term support I don't just build features—I help businesses create better mobile products by improving stability, performance, user experience, and maintainability. If you're looking for a senior Android engineer who can contribute immediately and take ownership of technical challenges, I'd be happy to discuss your project.

🚀 I'll launch your Android app - fast, clean, and scalable! Many of my clients are startup founders, product managers, and marketers who need high-quality Android apps - built fast, with long-term scalability and Google Play compliance. I’m a Senior Android Developer with 8+ years of experience ✅ MVPs & startup prototypes ✅ Full-featured apps from scratch ✅ Firebase-powered apps (Auth, Firestore, Push, Remote Config) ✅ API integrations (Subscriptions, Ads, Maps, Stripe, REST, BLE, NFC, GPS) ✅ White-labeled apps for performance marketing (WebView or native, Play-compliant) ✅ Refactoring legacy: Java → Kotlin ✅ SDK & dependencies updates (targetSdk upgrade, etc.) 📈 Results I Deliver - Published 20+ apps to Google Play - Built MVPs in under 2 weeks - Reduced crash rates by up to 30% during refactors - Helped apps scale to 5M+ users - 15 apps became profitable after adding subscriptions or ads 🧠 Tech Stack Kotlin, Java, Jetpack Compose, Coroutines, MVVM, MVI, Clean Architecture, Room, Retrofit, Google API (in-app-billing, maps, auth etc.), Firebase services (push, remote config, database, analytics), GraphQl, automated testing etc. What I do most often 🔹 Firebase Integration - Set up Firebase Authentication (Google, Email) - Configure Firebase Realtime Database & Firestore - Enable Remote Config for dynamic feature control - Implement Firebase Cloud Messaging (FCM) for push notifications - Track custom events in Firebase Analytics - Set up Crashlytics and in-app updates (App Distribution) 🔹 UI & Design - Build Jetpack Compose UI based on Figma or Material Design - Implement dark/light theme switch - Add custom fonts and styles 🔹 WebView & White Apps - Create WebView-based apps for Google Play - Develop white-labeled apps with backend flexibility - Integrate cloaking logic via Remote Config or WebView bridging 🔹 API & Backend Integration - Connect app to REST or GraphQL APIs - Handle file upload/download - Display server data in UI (lists, forms, detail pages) - Implement Retrofit + Room local caching 🔹 Location & Maps - Show user location on Google Map - Display places/objects on the map - Build directions between two points - Use Geocoding and Places API 🔹 Payments - Integrate Stripe for payments and subscriptions - Use Google Play Billing Library for subscriptions and purchases 🔹 Camera & Media - Take photo or video using CameraX - Add watermarks to captured images - Compress and upload media files 🔹 Hardware Features - Implement BLE and NFC interactions - Use GPS tracking and geofencing - Work with Beacons and Android TV 🔹 Data Storage - Set up Room, Realm, or StorIO for local data storage - Enable offline-first functionality with sync 🔹 Debugging & Maintenance - Fix crashes, bugs, and ANRs - Monitor logs and handle edge cases - Improve battery and memory efficiency 🤝 Let’s work together If you’re looking for a developer who delivers fast, clean, scalable Android apps - I’m ready to help. Send me a message, and let’s launch your product 🚀

From fitness apps featured by Apple to AI-powered platforms with 20K+ users, I build high-performance mobile apps that feel great, scale smoothly, and deliver real business impact. As a Senior Mobile App Developer with 10+ years of experience, I combine deep engineering expertise with strong product thinking to help founders launch faster and grow confidently. I’m a Mobile App Developer specializing in iOS mobile app and Android mobile app development, working with Swift, Kotlin, and Flutter to build production-ready solutions with clean architecture, smooth UX, and long-term maintainability. As a hands-on Flutter Developer, Swift Developer, and Kotlin Developer, I create cross-platform and native mobile apps powered by modern AI and scalable backend systems. Clients value that I don’t just “write code” — I act as a product-minded Mobile App Developer, helping shape the roadmap, optimize monetization, and make smart technical decisions from day one. 📈 Highlights & Proven Results • Fitness iOS Mobile App Featured by Apple Built using Swift & SwiftUI with HealthKit and Core Data integration. A premium-quality iOS mobile app focused on performance, clean UI, and personalized fitness experiences. • Art & Exhibition Finder Android & iOS Mobile App (10K+ Daily Users) Large-scale cross-platform mobile app using Flutter, Google Maps, and Firebase. Delivered high-performance caching, push notifications, analytics, and scalable backend infrastructure. • AI-Powered Voice Shop Assistant (ChatGPT + Twilio) Developed an AI-driven mobile solution using OpenAI API, conversational AI, and real-time voice processing. A strong example of AI integration inside a production-ready mobile app. • AI Parenting iOS & Android Mobile App (1,000+ Downloads in First Week) Core ML, Firebase backend, push notifications, and personalized AI insights. Secure, scalable architecture designed for long-term growth. • Viral AI Attractiveness Mobile App (20K+ Downloads) Face detection, AI scoring engine, subscription monetization, and ASO-driven growth. Engineered for scale across both iOS mobile app and Android mobile app platforms. 🧰 What I Bring as a Mobile App Developer Platforms: iOS, Android, Flutter, watchOS, tvOS Languages: Swift, Kotlin, Dart, Objective-C Architecture: MVVM, VIPER, TCA, Clean Architecture UI: SwiftUI, UIKit, Jetpack Compose AI & ML: OpenAI API, ChatGPT integration, Core ML, NLP, Computer Vision Backend: Firebase, Supabase, REST APIs, GraphQL, WebSockets Monetization: RevenueCat, Superwall, subscriptions, paywalls Analytics: Amplitude, Firebase Analytics, AppsFlyer Advanced: Push notifications, VoIP (Twilio/Agora), geolocation, offline mode, barcode scanning, ARKit CI/CD: Fastlane, Xcode Cloud, GitHub Actions, Codemagic As a cross-platform Flutter Mobile App Developer and native iOS / Android Mobile App Developer, I specialize in turning early ideas into scalable AI-powered products — from architecture and development to testing, analytics, deployment, and post-launch growth. 💬 Why Clients Choose Me Clients often say I “just get it.” I translate business goals into scalable, high-performance mobile apps built with clean code, strong UX, and future-proof architecture. If you’re looking for a Senior Mobile App Developer (Swift, Kotlin, Flutter, AI) who thinks like both an engineer and a product owner — I’d be happy to help launch or scale your next iOS mobile app or Android mobile app. Updated: 03.07.26

$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.

Building a high-performance mobile application requires more than just writing code—it requires a robust architecture that can grow with your business. Whether you are launching a greenfield project or need to refactor a legacy codebase, I specialize in delivering production-ready mobile solutions that are clean, testable, and easy to maintain. My core expertise lies in Kotlin Multiplatform (KMP). I bridge the gap between Android and iOS, helping teams reduce development overhead and codebase maintenance by sharing logic without sacrificing native performance. Why work with me? Architectural Rigor: I don’t just implement features; I build systems. My work is anchored in Clean Architecture, MVI, and MVVM patterns, ensuring your app is built to scale. Proven Delivery: I have a track record of shipping complex applications—from ride-hailing platforms like Feres to secure, high-traffic messaging apps—handling everything from UI implementation to intricate backend integration. Modern Workflow: I leverage AI-assisted engineering to accelerate development and debugging, applying rigorous human engineering judgment to ensure your product remains rock-solid and secure. My Technical Stack: Frameworks: KMP, Compose Multiplatform, Jetpack Compose. Architecture: Clean Architecture, MVI, MVVM, Multi-module Gradle. Backend/Integration: Ktor, Retrofit, REST APIs, DTO mapping, Error Handling. Database/Storage: Room, DataStore, Firebase, FCM/APNs. Advanced Features: Maps, Location Tracking, Chat, Media (ExoPlayer/CameraX), QR Scanning. Recent Success: I recently led the KMP frontend refresh for the Feres suite (Ride-hailing, Driver, and Delivery apps). This project required complex platform-specific implementations (expect/actual), seamless push notifications, and high-performance UI implementation using Compose. If you are looking for an engineer who communicates clearly, respects deadlines, and treats your codebase with the care it deserves, let’s discuss how I can help bring your project to the next level.