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Hello! I’m Mikolaj, a full stack web and mobile app developer with 5+ years of experience building production ready mobile apps, SaaS platforms, MVPs, marketplaces, admin dashboards, and AI-powered applications. I specialize in React Native, Expo, Flutter, Swift, Kotlin, Next.js, Node.js, Firebase, Supabase, PostgreSQL, Stripe, RevenueCat, and AWS. I can help you build a new product from scratch, improve an existing MVP, fix bugs, optimize performance, or prepare your app for App Store and Google Play release. What I Can Help You With 📱 Mobile App Development Cross-platform iOS and Android apps using React Native, Expo, and Flutter, with native Swift/Kotlin integrations when needed. I handle architecture, UI implementation, API integration, testing, builds, and store submission. 💻 Web Apps & Admin Panels Modern web applications, dashboards, and SaaS platforms using React, Next.js, TypeScript, and Tailwind CSS. ⚙️ Backend Development Secure and scalable APIs with Node.js, Express, NestJS, Firebase, Supabase, and PostgreSQL. I build authentication, real-time features, subscriptions, chat, notifications, and admin systems. 💳 Payments & Subscriptions Stripe, RevenueCat, in-app purchases, subscription logic, webhook handling, and payment flows for mobile and web apps. ☁️ Deployment & DevOps AWS, Docker, GitHub, CI/CD, app store deployment, production configuration, bug fixing, and performance optimization. Project Types I Work On * MVPs for startups * SaaS platforms * AI-powered mobile and web apps * Marketplaces * Chat and social apps * E-commerce platforms * Booking and on-demand service apps * Internal business tools * Admin dashboards * Subscription-based apps Why Work With Me I take ownership of the full development process, from planning and architecture to launch. I write clean, maintainable code, communicate clearly, and focus on delivering a product that is stable, scalable, and easy to continue building on. I’m especially interested in long-term projects where I can help improve the product, add new features, and support growth after launch. ✨ Let’s build something reliable, modern, and ready for real users. Feel free to reach out and tell me about your project.

🚀 Mobile App Developer with 8+ years building high-performance iOS and Android apps that reach real users and drive real results. I specialize in cross-platform and native development with React Native, Expo, Flutter, FlutterFlow, and Swift - delivering polished, production-ready apps from concept to App Store launch. Before going full-time into mobile development, I worked in digital marketing and e-commerce - so I don't just build apps, I build apps that convert and retain. That means I understand LiveOps, retention mechanics, push notification strategy, onboarding flows, and ASO at a level most developers simply don't. 🔧 WHAT I BUILD ✅ Cross-platform apps with React Native + Expo (single codebase for iOS & Android) ✅ Flutter & FlutterFlow apps - rapid UI development with pixel-perfect results ✅ Native iOS apps in Swift / SwiftUI for performance-critical use cases ✅ Real-time features: WebRTC video/audio & live streaming, live chat, push notifications, geolocation ✅ LiveOps & engagement systems: progression, reward loops, streaks, timed events, leaderboards ✅ Gamification for non-gaming apps - points, badges, levels, quests that measurably lift retention ✅ Video & streaming: HLS playback, watch-state and episode progression, content scheduling ✅ Backend integrations: REST, GraphQL, Firebase, Supabase, AWS Amplify ✅ SDKs: Stripe, RevenueCat, Twilio, Agora, Google Maps, OneSignal, Sentry ✅ App Store & Google Play deployment, legacy refactors, performance tuning, code audits 📈 ENGAGEMENT & LIVEOPS EXPERTISE Where I stand out is building the systems that keep users coming back after install day: → LiveOps tooling: remote config, feature flags, scheduled content drops and timed events - run your app like a live service without shipping a new build → Progression & reward systems tuned with real analytics data → Retention & lifecycle engagement: segmented push campaigns, re-engagement flows, personalisation → Experimentation: A/B testing and staged rollouts with clear success metrics → Real-time & community: WebRTC live video/audio, chat, presence, audience participation I design engagement features around D1/D7/D30 retention, session frequency, and conversion to paid - not just tickets. 💡 HOW I WORK Clear communication, well-structured TypeScript-first code, and relentless attention to detail. I document decisions and keep you in the loop at every milestone. I've worked with startups, scale-ups, and small businesses across the US and Europe - solo or within distributed teams, on greenfield products and messy legacy codebases alike. I'm responsive, deadline-aware, and I treat your app like it's mine. 🛠 TECH STACK Mobile: React Native, Expo, Flutter, FlutterFlow, Swift, SwiftUI State: Redux Toolkit, Zustand, Riverpod, MobX Real-time & Media: WebRTC, Agora, SocketIO, HLS streaming LiveOps & Growth: Firebase Remote Config, feature flags, A/B testing, OneSignal, Amplitude, Mixpanel Backend: Firebase, Supabase, Node.js, REST, GraphQL Data: SQLite, Realm, AsyncStorage, Core Data CI/CD & Testing: GitHub Actions, Fastlane, EAS Build, TestFlight, Jest, Detox, XCTest Design: Figma (wireframes or full specs) 🌍 INDUSTRIES E-commerce | Health & fitness | Streaming & vertical video | Marketplaces | SaaS | Social & community | On-demand | EdTech | FinTech | High-engagement consumer apps 📦 WHY CLIENTS CHOOSE ME → Full ownership from wireframe to live App Store listing → Retention-first mindset: LiveOps, gamification, and engagement loops built in from day one → Strong English, US timezone overlap available → No disappearing acts - consistent updates via Slack/email → Business-aware developer who thinks beyond the ticket Let's build something great together. Send me a message and let's discuss your project. KEYWORDS: React Native developer, Flutter developer, Expo, iOS, Android, Swift, cross-platform app, WebRTC developer, live streaming app, video streaming, LiveOps, gamification, retention mechanics, progression systems, reward loops, A/B testing, remote config, push notifications, Firebase, Supabase, Stripe, RevenueCat, subscriptions, real-time chat, MVP development, app audit, performance optimization

"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.

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.

🐇🎩 Building products is like magic: instead of rabbits, I pull working software out of requirement docs.✨ Top Rated Plus on Upwork, top 3% globally ⚡ WHAT YOU GET ▸ 12+ Full Stack Developer React Node | AI development | SaaS Developer | MERN stack ▸ 60+ delivered projects across AI SaaS, CRM systems, dashboards, automation platforms, healthcare, legal tech, real estate, e-commerce, trading software ▸ 15+ AI-powered SaaS MVPs, AI CRM systems, RAG tools, OCR/PDF processing, OpenAI and Claude integrations built from validation to launch ▸ 25+ scalable React, Next.js, Node.js, Python AI backend, PostgreSQL, Stripe, AWS, Docker builds, full technical ownership, secure architecture, production-ready delivery as a Full Stack AI SaaS Developer ⚡ ACHIEVEMENTS | CLIENT WINS FROM AI SAAS & FULL STACK DEVELOPMENT ▸ 26-day ROI recovery recruitment agency launched a Recruiting SaaS Platform with CRM automation, 2x faster candidate workflows ▸ 93% faster estimation construction business reduced quoting time from 8 hours to 30 minutes with a custom Construction Estimator Web App ▸ #4 Product of the Day legal tech founder launched an AI Legal Assistant, RAG-powered document search, OpenAI integration, AI workflow automation ▸ 5+ secure healthcare platforms med spa businesses improved provider/patient workflows with role-based access, admin dashboards, API integration ▸ 10+ CRM & trading systems replaced manual operations with custom CRM platforms, trading dashboards, reporting tools, scalable workflow automation ⚡As a Full stack AI SaaS developer I can support with: ▸ AI-powered SaaS MVPs, product validation ▸ AI agent workflow platforms, workflow automation system ▸ AI-powered Custom CRM system, platform ▸ AI-enabled admin dashboard, panel, machine learning ▸ Role-based workflow platform secure permissions ▸ Secure multi-user web application, scalable backend system ▸ Booking and scheduling platform service businesse ▸ Provider / patient workflow systems healthcare solution ▸ Multi-stage automation workflows complex processe ▸ RAG-powered document intelligence, search system ▸ LLM-powered data processing using openai, modern AI tool ▸ AI-assisted analytics, reporting ▸ OCR and PDF processing pipeline ▸ Rule-based insight engines ▸ Secure backend API development, Third-party API integration ▸ Multi-tenant SaaS platforms workspace isolation ▸ Dashboard, data visualization system ▸ HIPAA / GDPR-compliant platform ⚡ MY CORE STACK as a Full stack Web Developer | Full stack developer React Node | Full stack Developer AI React, Next.js, Node.js, Python, JavaScript, Supabase, PostgreSQL, MySQL, MongoDB, AWS, Docker, nginx, Stripe, AI tools like Openai, Claude, LangChain. I also work with laravel, PHP when a project requires a Full stack developer laravel or integration into an existing system. As a Full stack developer SaaS ( full stack developer ai ) I cover full product delivery: frontend, backend, infrastructure, APIs, and AI logic. I can work as a React developer, Front end developer, Backend developer, Web developer python, React web developer, Full stack web developer depending on the scope. On the frontend, I work with HTML, CSS 3, Tailwind CSS, Vue.js, Angular, Bootstrap for specific stacks or legacy support. For SaaS products, I often work with full stack node.js react development, building React and Node.js SaaS applications with dashboard, admin panel, and secure APIs. I also work as a Full stack developer node | Full stack developer node js, focusing on performance and scalable architecture. When AI is involved, I support projects as a python developer with Python AI backend development, including RAG systems, OCR pipelines, document processing, intelligent automation I also have experience working with mobile app development and can contribute as a React Native developer, building cross-platform apps, react native integrated with backend systems and APIs In addition, I've worked as a full stack developer shopify, wordpress developer workflows, python full stack developer, front end developer react, full stack developer php and niche integrations, including Lazada developer-related marketplaces, helping businesses extend their platforms with custom features, payments and automation. What sets me apart is product thinking. As a technical partner, cto-level contributor, I help define Software Architecture & Design, avoid unnecessary complexity, build solutions that are ready for real users. I also collaborate on web design, ui ux web design, ux designer, ui ux web designer workflows to ensure products are intuitive and easy to use. If you need full stack web development, full stack saas architecture, AI-powered features, reliable Full stack website developer, Full stack developer saas, Full stack AI SaaS developer, I can help you build and scale your product. 💬 Message me with your idea, I’ll share a relevant case, technical approach, clear estimate from a full stack developer.

Founder of Lodesoft — a development team focused on building efficient, scalable, and profit-driven IT solutions. We don’t just create websites, bots, and applications — we build tools that help businesses automate workflows, reduce manual tasks, and increase revenue. Every project we deliver is a custom solution tailored to specific business needs, never a template. Our approach is fast, precise, and business-oriented. What matters is not only the product itself, but the outcomes it delivers: growth, usability, automation, and profitability. We work with clients of all sizes — from solo entrepreneurs and small teams to large enterprises. With 4+ years of development experience, I lead projects from concept to deployment and personally oversee every stage to ensure quality, clarity, and alignment with your business goals. Our Key Services: Web Application & Website Development — From corporate portals to sophisticated interface solutions designed for conversion optimization and enhanced user experience. iOS & Android Mobile Development — Native solutions or optimized applications adapted for different operating systems, ensuring convenient access from any device. CRM & Internal Systems Development — We configure and implement management dashboards, databases, analytics tools, and sales automation solutions. Desktop Applications — We create installable software for Windows and macOS with custom business logic: process automation, management tools, data processing, and internal workflow optimization. Smart Chatbots — Intelligent bots for customer support, sales, HR, and analytics that reduce team workload and enhance customer experience. Telegram Solutions — Web applications and multi-bots (client + admin) that launch with a single click and serve as alternatives to mobile applications. Optimization & Enhancement of Existing Solutions — Fixing bugs, improving interfaces, and increasing performance. AI Integration & Implementation — Automating routine processes, implementing ML/AI for data processing, predictive analytics, and service quality improvement. SaaS Services — We develop cloud-based digital platforms operating on subscription models: from architecture to user accounts, billing systems, role management, and analytics. MVP Products — Digital solutions with essential functionality for rapid deployment, effectiveness evaluation, and subsequent scaling to meet evolving business needs. Tech Stack: JavaScript/TypeScript (React, React Native, Next.js), Python (Django, FastAPI) | QA & Testing | AI & ML Integration