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🚀 Mobile App Developer with 8+ years building high-performance iOS and Android applications that reach real users and drive real results. I specialize in cross-platform and native development using React Native, Expo, Flutter, FlutterFlow, and Swift - delivering polished, production-ready apps from concept to App Store launch. My background blends technical depth with a sharp sense for user experience and product thinking. Before going full-time into mobile development, I worked in digital marketing and e-commerce, which gave me a valuable edge: I don't just build apps - I build apps that convert, retain users, and perform in the real world. That marketing DNA means I understand mobile growth, push notification strategy, user onboarding flows, and ASO (App Store Optimization) 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: live chat, push notifications, geolocation, background sync ✅ Backend integrations: REST APIs, GraphQL, Firebase, Supabase, AWS Amplify ✅ Third-party SDKs: Stripe, RevenueCat, Twilio, Google Maps, OneSignal, Sentry ✅ App Store & Google Play deployment - certificates, signing, submission, review cycles ✅ Legacy app refactors, performance tuning, and code audits 💡 HOW I WORK I believe great mobile apps are built through clear communication, well-structured code, and relentless attention to detail. My workflow is transparent: I document decisions, write clean and maintainable code (TypeScript-first), and keep you in the loop at every milestone. I've worked with startups, scale-ups, and small businesses across the US and Europe - handling full project lifecycles solo or as part of distributed engineering teams. I adapt quickly to existing codebases, and I'm comfortable leading architecture decisions as well as executing within defined specs. I'm responsive, deadline-aware, and genuinely invested in the success of every product I touch. I treat your app like it's mine. 🛠 TECH STACK AT A GLANCE Mobile: React Native, Expo SDK, Flutter, FlutterFlow, Swift, SwiftUI, Objective-C (legacy) State Management: Redux Toolkit, Zustand, Riverpod, MobX, Context API Navigation: React Navigation, Expo Router, Flutter Navigator 2.0 Backend & Cloud: Firebase (Auth, Firestore, Storage, Functions), Supabase, Node.js, REST, GraphQL Databases: SQLite, Realm, AsyncStorage, Core Data DevOps & CI/CD: GitHub Actions, Fastlane, EAS Build, TestFlight, Bitrise Testing: Jest, Detox, Flutter Test, XCTest Design: Figma (can work from wireframes or full design specs) 🌍 INDUSTRIES SERVED E-commerce & retail apps | Health & fitness | Marketplace platforms | SaaS mobile clients | Social & community | On-demand services | EdTech | FinTech (payments, wallets) 📦 WHY CLIENTS CHOOSE ME → Full ownership from wireframe to live App Store listing → Strong English communication, US timezone overlap available → No disappearing acts - consistent updates and Slack/email availability → Experience with both greenfield projects and messy legacy codebases → 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: mobile app developer, React Native developer, Flutter developer, Expo developer, iOS developer, Android developer, Swift developer, SwiftUI, FlutterFlow, cross-platform app, hire mobile developer, React Native freelancer, Flutter freelancer, app development, mobile app design, Firebase integration, Supabase, App Store submission, Google Play deployment, TypeScript mobile, Redux Toolkit, Zustand, Riverpod, REST API integration, GraphQL mobile, push notifications, Stripe in-app payments, RevenueCat subscriptions, real-time chat app, geolocation app, e-commerce mobile app, SaaS mobile client, startup app development, MVP development, app audit, performance optimization

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.

✅ .NET Full Stack Developer 20+ years of experience ✅ Build powerful .Net solutions that drive business growth ✅ C# .Net developer with 15+ years of experience ✅ Developed 50+ applications ✅ Crafted 200+ user-friendly interfaces that drive real business results. The clients say "It doesn't feel like outsourcing, but instead like we have our own remote developers." "They had great soft and hard skills and were full of ideas and drive!" I lead the fullstack and mobile development team at Itexus, a professional software development and consulting company focused on Fintech, Insurance, Healthcare, etc. I have 20+ years of experience in the .net architect development of web and mobile applications, .net, python, node.js, java developer as well as javascript, react .net, angular, AI frameworks and libraries. 👨‍💻.NET Full Stack Expertise .NET full stack – strong background in End-to-end development from database to UI using Microsoft stack .NET Core – deep expertise, cross-platform backend services .NET Angular – Full stack development on .NET backend and Angular frontend for enterprise-grade solutions .net core angular – Building complete systems with seamless backend–frontend integration .NET Core Angular – Scalable and secure web apps using .NET Core and Angular Angular .NET solutions – Using Angular for UI and .NET for API and business logic .net core developer – Proven experience delivering high-performance backend solutions using .NET Core .net core react – Building robust, scalable web applications with .NET Core APIs and React frontends c# .net developer – End-to-end development expertise using C# and the .NET ecosystem c# .net core – Advanced solutions built on C# with .NET Core for modern, cross-platform applications 👨‍💻 BACKEND Development Python: Expert in Python for server-side development Frameworks: Proficient in Django and Flask for building web applications Databases: Skilled in SQL, PostgreSQL, MySQL, and MongoDB for efficient data management Architecture: Experienced in applying MVC patterns for scalable applications APIs: Capable of integrating external services through REST and GraphQL 👨‍💻 FRONT END Development Proficient in HTML5, CSS responsive, JavaScript Experienced in React.js, Angular, Vue.js, react native, ionic, xamarin developer Responsive, cross-browser, ui/ux designer, ux/ui dashboard, ui ux designer app 👨‍💻AI TOOLS OpenAI API, DeepFace, ML/DL frameworks (TensorFlow, Keras, PyTorch, Scikit-learn), LangChain, Mistral, AgenticAI, Transformers RAG + custom AI tools: Document recognition and processing, Market Grabber, project management bots, AI for telephony, video/audio analysis Mobile App Development Native Mobile Development: Android, Kotlin, Java, iOS, Swift, KMP, KMM. Cross-Platform/Hybrid App Development: Flutter, Swift, Objective C, React Native, Xamarin, MAUI. General Expertise Website & Full Stack Development: Full stack development with ai .net full stack developer, .net software engineer, .net programmer, full stack developer, ai python full stack developer django, full stack web developer, full stack development, cms developer DevOps/DevSecOps: AWS, Azure, Docker, Kubernetes, GitLab-CI, Ansible, Terraform, etc Cross-platform app building with three.js, web application design, webflow web designer, website builders Integration tools: Data integration, websockets, ABP Framework, discord, Autotask Experienced in .net core web api, fullstack .net developer roles, with strong skills as a .net specialist. Skilled angular .net react developer, java developer with solid c sharp expertise. Worked on kogito for business automation, delivered ui ux-focused solutions. As an azure data engineer, handled scalable data pipelines. rust developer, python projects include backend developer tasks. Built app as a xamarin and web developer using java and javascript. Skilled in postgresql and web scrapping. Maintained legacy systems with .net webform. Collaborated with nft marketers, managed nft collab manage tasks. Full stack with react nodejs, modern react, including react typescript, react native developer roles. Acted as product owner in agile teams. Cloud deployments done on azure. Built interactive UIs using blazor. Why Choose us Microsoft certified talented developers and senior .net developer team High QA standards, including qa engineer roles Modern solutions: NFT programmer, metaverse, Microsoft .net, windows 10, Power Apps developer, SharePoint, market grabber Scalable team: full stack software developer, front end programmer, ios developer, ui ux designer Industries Banking, Trading, Cryptocurrency, Asset Management, Lending, Retail, Real Estate & Property Management, Food Delivery, Entertainment, Hospitality, Construction, Sports & Fitness, Travel & Tourism, Wellness, Medical Dashboard, Marketplace, E-commerce, Automotive, Human Resources, Education, E-learning, AI Assistants Seek new projects to put our .net ai, bring value to individuals, startups, companies.

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 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). I embrace modern AI-powered development workflows using tools like 🤖 Claude Code, 🧠 Cursor and 🏄 Windsurf IDEs. What I do: 📱 Mobile apps, 🖥️ Desktop apps, 🌐 Websites, ⚙️ Web services, 👨🏻‍💻 Admin Backends, 🧩 API for them, 🤖 ChatGPT integrations. I embrace modern AI-powered development workflows using tools like 🧠 Cursor IDE and 🤖 Claude Code. Kinds of software I've created: 🛍️ Shopping & online stores, 🏃 Sports, 🎮 Games, 🧘 Medicine & well-being, ✈️ Travel, 💰 Bank systems, 📣 Ad networks, 🛡️ Insurance, 🛬 Landing pages. 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, 🐻 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, 🎥 Lottie Files, 🥤 Cocoa Touch, 🥥 Cocos2D, 🅻 Laravel, 🎵 Symfony, 🆈 YII and YII2, 🔥 CodeIgnitor, 🆉 Zend Framework, 📍 CoreLocation, 🎥 CoreAnimation, 🏠 Apple HomeKit, ❤️ Apple HealthKit, 💰 Superwall. Databases: 🍃 Mongo, 🐬 MySQL, 🪶 SQLite, 🍉 Watermelon DB, ⚡️ Supabase, 🔥 Firebase, 🐘 Postgres, 📄 TypeORM, ➡️ Doctrine, ⚪ DynamoDB/PartiQL, 🔴 Oracle, 🅲 CoreData, 🟣 Realm. Cloud Computing: 🐳 Docker, ☸️ Kubernetes, ☸️ Google Kubernetes Engine, 🌊 DigitalOcean Cloud, 🅷 Heroku, 🆁 Render, ☀️ Netlify, 🅰 Microsoft Azure, 🔺 AWS Lambda. I have developed over 20 iOS apps, 15 React Native apps, several Android apps, APIs for some of them, over 20 websites. I'm proficient in problem-solving and have solid track record of success in solving complex problems for teams that have struggled to do so on their own. I like to explore modern technologies, build amazing user interfaces, develop software of any complexity. I always strive to create apps and sites according to the best practices, thoroughly test them and provide the best user experience. It's important to me to write clean and readable source code which is easy to understand and maintain for any other developer.

𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸, 𝘁𝗼𝗽 𝟯% 𝗴𝗹𝗼𝗯𝗮𝗹𝗹𝘆 ⚡ WHAT YOU GET ✔️12+ Full Stack Developer | AI development | SaaS Developer ✔️60+ delivered projects across AI SaaS, CRM systems, dashboards, automation platforms, healthcare, legal tech, real estate, e-commerce, and trading software ✔️15+ AI-powered SaaS MVPs, AI CRM systems, RAG tools, OCR/PDF processing, OpenAI and Claude integrations built from idea validation to production launch ✔️25+ scalable React, Next.js, Node.js, Python AI backend, PostgreSQL, Stripe, AWS and Docker builds with 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 and 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 with RAG-powered document search, OpenAI integration, and AI workflow automation ✔️5+ secure healthcare platforms — healthcare and med spa businesses improved provider/patient workflows with role-based access, admin dashboards, and API integration ✔️10+ CRM & trading systems — business owners replaced manual operations with custom CRM platforms, trading dashboards, reporting tools, and scalable workflow automation ⚡As a Full stack AI SaaS developer I can support you with: ✔️ AI-powered SaaS MVPs and product validation ✔️ AI agent workflow platforms and workflow automation system ✔️ AI-powered CRM system and Custom CRM-style platform ✔️ AI-enabled admin dashboard and Admin panels and internal tools ✔️ Role-based workflow platform with secure permissions ✔️ Secure multi-user web application and scalable backend systems ✔️ Booking and scheduling platform for service businesses ✔️ Provider / patient workflow systems for healthcare solutions ✔️ Multi-stage automation workflows for complex processes ✔️ RAG-powered document intelligence and search systems ✔️ LLM-powered data processing using openai and modern AI tools ✔️ AI-assisted analytics and reporting ✔️ OCR and PDF processing pipelines ✔️ Rule-based insight engines ✔️ Secure backend API development and Third-party API integration ✔️ Multi-tenant SaaS platforms with workspace isolation ✔️ Dashboard and data visualization systems ✔️ HIPAA / GDPR-compliant platforms ⚡ MY CORE STACK as a Full stack Web Developer React, Next.js, Node.js, Python, JavaScript, Supabase, PostgreSQL, MySQL, MongoDB, AWS, Docker, nginx, Stripe and AI tools like Openai, Claude, LangChain. I also work with laravel and PHP when a project requires a Full stack developer laravel or integration into an existing system. As a Full stack developer SaaS, 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, or Full stack web developer depending on the scope. On the frontend, I also work with HTML, CSS 3, Tailwind CSS, Vue.js, Angular, and Bootstrap when a product requires a specific stack or legacy support. For SaaS products, I often act as a Full stack developer React, building React + Node.js SaaS applications with dashboards, admin panels, role-based access, 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, and intelligent automation. I also have experience working with mobile app development and can contribute as a React Native developer, building cross-platform apps with react native that integrate seamlessly with backend systems and APIs. In addition, I’ve worked with shopify, wordpress developer workflows, 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 and cto-level contributor, I help define Software Architecture & Design, avoid unnecessary complexity, and build solutions that are ready for real users I also collaborate on web design, ui ux web design and 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 or a reliable Full stack website developer, I can help you build and scale your product. I am especially strong as a Full stack developer saas, Full stack AI SaaS developer, for complex platforms and AI-driven products. 💬 Message me with your idea - I’ll share a relevant case, technical approach, and a clear estimate from a full stack developer.

Fractional CTO • Technical Lead • SaaS Architecture • Mobile App Development • Code Review • Technical Due Diligence • Platform Audit • Chief Technical Officer • CTO consultant • Software developer consultant If you are a founder or executive who needs to ship faster, stop wasting development budget, and get full visibility into what your team is actually doing, we should talk. I provide the technical leadership required to define exactly what needs to be built, when, and by whom. I translate business goals into technical reality without the usual overhead. I typically step in when something feels misaligned: delivery is slower than expected, communication with developers is unclear, or technical decisions are being made without a full business context. I don’t just advise; I set up tracking, break down tasks, audit code, and lead the team until the system actually works. Proven Impact: - Reduced branded app development time in healthcare for 28.8% ( from 60 to 43 hours ) through process optimization. - Combined a team and resumed shipping within three weeks after a technical co-founder’s departure. - Prepared technical estimates and roadmaps that helped startups secure investment rounds. - Built systems eliminating manual paper workflows across hundreds of locations. I have over 15 years of experience in development. During this time: - delivered 70+ Web and Mobile applications shipped; - Managed projects with $100k+ budgets; - 40% of my mentees have progressed to Team Lead roles. - over 10 years specializing in React Native and the JavaScript ecosystem (Node, Next.js, TypeScript). Hold a Master’s Degree in Computer Science. Gained business knowledge and participated in accelerators as a technical co-founder. How I Support Your Business: I am language-agnostic when it comes to leadership. My focus is on whether the architecture is maintainable and the team is building the right thing. Fractional CTO & Strategy: Technical roadmaps, due diligence, and vendor evaluation. Team Leadership: Hiring, managing distributed teams, and overseeing offshore developers. Quality & Security: Code audits, delivery processes, and security architecture by design Core Technical Stack: - Backend: Node.js (NestJS, Express), TypeScript - Frontend: React, Next.js, Redux, MobX - Mobile: React Native, Expo ( Native iOS ) - Databases: PostgreSQL, MySQL, MongoDB, Firestore. - Infrastructure: AWS, Azure, Docker, CI/CD. Industry Experience: FinTech ( Trading, Payroll, Budgeting), EdTech, Healthcare, Rental Marketplaces, IoT, Logistics, and Enterprise Solutions across the US, UK, EU, Australia, and the Middle East. Functionality Experience: offline-first apps, offline mode support, white-label apps infrastructure, Stripe integration, multi-tenant systems, complex data synchronization, and in-app purchases. Despite using AI in everyday life, I prefer "boring," proven technology that ships today and holds up a year from now over chasing monthly trends. My longest client relationships span 4 to 9 years. Core Services: Fractional CTO • Technical Leadership • MVP Development • SaaS Architecture • Code Review • Product Roadmap • CI/CD Setup • Technical Due Diligence • Security Audit • Fractional CIO If you are building for the long term and want technical leadership you can trust, let’s talk. Note: 𝐈 𝐃𝐎 𝐍𝐎𝐓 𝐖𝐎𝐑𝐊 𝐰𝐢𝐭𝐡 𝐠𝐚𝐦𝐛𝐥𝐢𝐧𝐠, 𝐜𝐫𝐲𝐩𝐭𝐨, 𝐯𝐢𝐛𝐞 𝐜𝐨𝐝𝐞𝐝 𝐚𝐩𝐩𝐬