I started his career as a programmer in Delphi, I work more than 15 years. There are also skills in C # (winforms) . (MSSQL, Oracle, MySQL, SQLite, PostgreSQL), also has skills with api functions, sound, theards etc. Working with REST API, like Elation, SureScript. Wrote simple backend server. Mobile develop on Delphi and Kotlin Compose. Have skill with https, ftps, sftp (etc) protocols.

🚀 𝐀𝐧𝐲𝐨𝐧𝐞 𝐜𝐚𝐧 𝐠𝐞𝐧𝐞𝐫𝐚𝐭𝐞 𝐀𝐈 𝐜𝐨𝐝𝐞. 𝐁𝐮𝐭 𝐈 𝐦𝐚𝐤𝐞 𝐢𝐭 𝐬𝐞𝐜𝐮𝐫𝐞, 𝐫𝐞𝐥𝐢𝐚𝐛𝐥𝐞, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞, 𝐚𝐧𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲. 🔥 85+ completed projects (40+ SaaS & MVP platforms) delivered as a Full Stack Developer & React Developer 💰 Startup MVP platforms generated $500K+ revenue in their first 6 months 👥 SaaS products supporting 10K–50K active users built by an expert Full Stack Developer 📈 One platform grew from 2K to 7K users through continuous product updates by a Web Developer ⚡ Backend systems processing 300K–500K API requests every month 🚀 Startup MVPs delivered in 2–4 weeks (complex Startup MVP delivered in just 2 days by a Full Stack Developer) ⏱️ Optimized AI dashboard loading times from 2 minutes down to 3 seconds for 10K–50K active users 🎬 Video generation architecture supporting a heavy load of several thousand concurrent users 📊 5+ years building SaaS platforms & Startup MVPs as a professional Full Stack Developer 📦 100+ API integrations completed across production systems by a Full Stack Developer ⚙️ 20+ backend architectures designed from scratch for Mobile App Developer projects 🧠 AI integrations across 30+ commercial projects as a React Developer & Full Stack Developer 💼 I help founders build SaaS platforms, Startup MVPs, AI applications, Customer Portals, Marketplaces, and scalable Web Applications using React, Next.js, Node.js, Supabase, PostgreSQL, Stripe, Redis, and AI APIs as a Full Stack Developer. 🛠️ As a SaaS Developer, MVP Developer, Full Stack Developer, Software Developer, React Developer, WordPress Developer, Mobile App Developer, and Web Developer, I've delivered 85+ production projects (40+ SaaS & MVP platforms). As a Full Stack Developer, I help startups validate ideas, launch products in 2–4 weeks (complex MVP platforms in 2 days), and scale apps supporting 10K–50K active users with $500K+ revenue milestones. 🚀 Many companies hire me as a SaaS Developer, MVP Developer, Full Stack Developer, Startup Developer, React Developer, WordPress Developer, Mobile App Developer, Web Developer, and AI SaaS Developer. As a Full Stack Developer, I build products designed to scale. Systems I've developed as a Full Stack Developer process 300K–500K API requests monthly, integrate 100+ APIs, support 10K–50K active users, and grow years after MVP launch, generating $500K+ revenue. 🎯 Unlike many Software Developers, WordPress Developers, or basic Web Developers, I focus on the entire product lifecycle as a Full Stack Developer—from MVP planning to production infrastructure, subscription systems, customer portals, and SaaS scalability. Whether you need a Full Stack Developer and React Developer for an AI dashboard or a Mobile App Developer for a cross-platform release, I deliver results. 🏆 Why Founders Hire Me as a SaaS Developer & Full Stack Developer: 5+ years working as a SaaS Developer, MVP Developer, React Developer, WordPress Developer, Mobile App Developer, Web Developer, and Full Stack Developer. As a Full Stack Developer, I delivered 85+ projects, including 40+ SaaS & MVP platforms supporting 10K–50K active users. Startup MVP delivered in 2–4 weeks (complex MVP platforms in 2 days) by an expert Full Stack Developer. Production-ready products supporting 10K–50K active users after launch designed by a Full Stack Developer. One Startup MVP built by a Full Stack Developer generated $500K+ revenue during its first 6 months. One SaaS platform grew from 2K to 7K users through feature releases managed by a Full Stack Developer. Backend systems processing 300K–500K API requests every month created by a Full Stack Developer. 100+ API integrations (Stripe, Supabase, OpenAI, CRMs, payment gateways) completed by a Full Stack Developer. As a Full Stack Developer, I optimized AI dashboard loading times from 2 minutes down to 3 seconds for 10K–50K users. Built high-load video generation systems supporting several thousand concurrent users as a Full Stack Developer. Redis optimization reducing database load by 70%+ on high-traffic SaaS platforms supporting 10K–50K active users. React performance optimization improving Lighthouse scores to 90+ and reducing bundle sizes by 40%+ as a dedicated React Developer and Full Stack Developer. Experience building subscription platforms, customer portals, internal business systems, marketplaces, admin dashboards, WordPress Developer setups, Mobile App Developer integrations, and multi-tenant SaaS applications as a Full Stack Developer. Production architecture designed by a Full Stack Developer to support years of growth and generate $500K+ revenue. 📈 🚀 Startup Growth & Production Software with a Full Stack Developer As a SaaS Developer, MVP Developer, React Developer, Web Developer, WordPress Developer, Mobile App Developer, and Full Stack Developer, I help founders launch complex MVPs in 2 days and build scalable software capable of supporting 10K–50K users and generating $500K+ revenue.

🔥 SaaS MVP in 4 weeks. No excuses. No rewrites. Just a product that ships. 🏆 8+ years of experience | 🏆 47+ shipped projects | 🏆 SaaS generating $1M+ ━━━━━━━━━━━━━━━━━━━ As a React Developer who has shipped production SaaS across fintech, healthcare, and B2B platforms, I know that fast doesn't mean fragile. As a Full Stack Developer React Node, I own the entire stack — from Frontend React interfaces to backend APIs — so nothing falls through the cracks between "frontend team" and "backend team." There is no gap. There is just delivery. Working as a software developer and mobile app developer for 8+ years means I've seen every failure mode: bloated scope, technical debt that kills velocity, UX bolted on as an afterthought. That's why I build differently. As a ux designer first and a React Developer second, I wireframe before I write a single line of code. Every Frontend React component I ship is backed by a decision — not a default. ━━━━━━━━━━━━━━━━━━━ WHY CHOOSE ME? As a Full Stack Developer React Node combining front end developer react expertise with robust backend systems, I think as a product engineer. Most frontend react work I've seen treats the UI as decoration. I treat it as the product. Working as a Frontend React specialist for years taught me: clean components, smart state management, and fast load times are non-negotiable. When clients hire a React Developer expecting "just UI," they get a Full Stack Developer React Node who catches the schema issues before they become a $50K refactor. That's the difference between a React Developer who codes and a Full Stack Developer React Node who ships. ━━━━━━━━━━━━━━━━━━━ WHAT I DELIVER ✅ SaaS Platforms — As a Full Stack Developer React Node I build dashboards, multi-tenant architectures, role-based access, and real-time sync using Frontend React with Node.js backends. From idea to deployed product in 4 weeks. Every Frontend React layer is optimized for real users, not just Lighthouse scores. ✅ Startup MVPs — Every React Developer on my team starts with a UX audit. We cut scope ruthlessly, ship a testable product, then iterate. No 6-month death marches. ✅ Web Apps & Portals — From e-commerce flows to internal tools, I work as a web developer who cares about conversion, not just code quality. Built on Next.js, TypeScript, and scalable backend architecture. ✅ AI Integration — LLM-powered features, vector search, intelligent automation. As a software developer building with AI since before it was trendy, I know what actually works in production. ✅ Payment & Subscription Systems — Deep experience with stripe integration: subscription billing, usage-based pricing, webhook handling, and fraud prevention. As an app developer building commerce products, I've handled $1M+ in transaction flows. ✅ Mobile Apps — Working as a react native developer and mobile app developer I ship cross-platform iOS/Android apps that share business logic with the web. One codebase, two platforms, zero compromise on UX. ✅ API Architecture — GraphQL and REST APIs built for scale. As a backend engineer, I design Node.js systems that handle real-time features, OAuth/JWT security, and complex third-party integrations. ━━━━━━━━━━━━━━━━━━━ TECH STACK Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, React Query — Frontend React that loads fast and scales clean. Also fluent in angular and vue for legacy or team-preference projects. Backend: Node.js, Express, NestJS, GraphQL, REST APIs — backend systems built to grow. Additional experience with python for data pipelines and automation, laravel vue for PHP ecosystems, and ruby on rails for legacy integrations. Database: PostgreSQL, MongoDB, Firebase, Supabase real-time Cloud: AWS, Vercel, Docker, CI/CD (GitHub Actions) Integrations: Stripe, Twilio, HubSpot, Zapier, n8n, OpenAI Additional: As a python developer I automate workflows and build data-heavy features. As a wordpress developer or webflow specialist I handle CMS projects when needed. Need a mern stack architecture that handles 100K users? As a React Developer who's built that — done. ━━━━━━━━━━━━━━━━━━━ HOW I WORK Before writing code, I spend time on user flows, wireframes, and design systems. This prevents rework. As a Full Stack Developer React Node, I think about the database schema, the API contract, and the UI state all at once — problems that span layers get caught at the design stage, not QA. A React Developer who only thinks about components is only half the job. A Full Stack Developer React Node who owns the entire delivery is what actually ships. I work with clear scope: you know exactly what's being built, by when, and for how much. No surprise invoices. No scope creep. The custom offer you approve is the product you receive. ━━━━━━━━━━━━━━━━━━━ READY TO BUILD? Message me with: → What problem does your product solve? → Who are your users? → What's your launch timeline? 👉 Click "Invite to Job" — and let's talk.

🚀 I am Andriy, a Senior Mobile App Developer with over 4 years of professional experience delivering high-quality mobile and web solutions for startups, growing companies, and enterprise clients. As a Mobile App Developer and Full Stack Developer, I specialize in building scalable, user-friendly, and high-performance applications for both mobile and web platforms using modern frameworks such as Flutter and web technologies. My work is focused on turning business ideas into reliable digital products that create real value for users and support long-term business growth. My skills: React Native Mobile App Development iOS Development Android App Development AI Mobile App Development Hybrid App Development App Development Flutter Mobile App Design Web Development Android Software Development Firebase React Artificial Intelligence Native App Development Kotlin Mobile App Development Consultation Smartphone Mobile App 💡 Throughout my career, I have worked on a wide range of projects across different industries as a Mobile App Developer and Full Stack Developer. My experience allows me to build modern, responsive, and intuitive applications with strong performance across platforms. As a Flutter Developer, I create visually polished apps with clean architecture, smooth animations, and strong functionality. Every project I take on is approached with attention to detail, code quality, and user experience. 🌍 My background includes work in industries such as social media, healthcare, education, manufacturing, automotive, finance, legal, sales, sports, and AI-powered products. I have built social platforms with interactive user flows, healthcare apps with secure data handling, finance products with reliable performance, and educational apps that make learning more engaging. As a Mobile App Developer and Full Stack Developer, I always adapt technical solutions to the unique needs of each business domain. 👨‍💻 I currently lead a professional team at JoinToIT in Kyiv, Ukraine, where we provide full-cycle mobile and web development services. Our team includes experienced specialists working as Mobile App Developers, Full Stack Developers, and Flutter Developers, and we collaborate closely to deliver high-quality products from concept to release. I understand how important communication, planning, and flexibility are during the development process, so we combine technical skills, creative thinking, and agile methodologies to ensure project success. ⚙️ I can support every stage of the product lifecycle: requirements analysis, architecture planning, UI/UX collaboration, app and web development, API integration, testing, debugging, deployment, and post-launch maintenance. My goal is not only to write clean code, but also to help clients make smart product decisions. A strong developer should think beyond implementation and focus on business goals, usability, performance, and scalability. 🧩 My technical stack includes Flutter, React, web technologies, Node.js, Firebase, MySQL, and API development using PHP Laravel, Node.js, and Python. I also have strong experience with third-party integrations, including Stripe, PayPal, Twilio, TextMagic, Xero, DocuSign, Google Maps, Facebook, Instagram, Twitter, and HelloSign. I understand how essential it is to build apps and web platforms that integrate smoothly with modern services. 📈 I take pride in being a developer who values reliability, transparency, and long-term results. I am always open to feedback, continuous improvement, and adopting new technologies that enhance product quality. Whether you need a Mobile App Developer, a Full Stack Developer, or a Flutter Developer, I can help build a solution that is modern, stable, and ready for growth. 🤝 As a Senior Mobile App Developer and Full Stack Developer, I am committed to creating applications that exceed expectations, deliver real business value, and provide seamless user experiences across both mobile and web platforms. Best regards, Andriy

✌️ Strong focus on creating stable, scalable, user-centered Android mobile ecosystems - that's me, your Android Developer with deep experience in Android Development. As an Android App Developer and Mobile App Developer, I deliver solutions across industries, ensuring each product has clean architecture, solid performance and intuitive user experience. As an Android Developer Kotlin, my team and I build Android apps (phone and tablet) of any complexity - delivery/ordering systems, logistics apps, marketplace apps, video/chat apps (WebRTC/VoIP), booking apps, online TV apps, educational apps, online stores, AndroidTV apps, and Mobile App Development with in-app purchases and subscriptions. 📈 As an Android Developer I turn product ideas into fast, reliable Android apps users love. As a Mobile Developer I build clear, maintainable solutions that scale. As a Mobile App Developer, I deliver end-to-end Mobile App Development: requirements, architecture, implementation, testing, App Store/Play Store deployment and post-release support. 🔮 My work as an Android Developer focuses on Kotlin, Java, Android SDK, Android Studio, Jetpack Compose, MVVM and Clean Architecture for robust code and smooth UX. As an android developer kotlin I integrate Firebase, RESTful APIs, user authentication, local and remote databases, push notifications and performance monitoring through Android Development. As an android developer kotlin, I treat Git, SQL and structured API Integration as daily tools, not extras. Although my primary title is Android Developer, I bring cross-platform knowledge as a Mobile Developer and Mobile App Developer from ios development, Swift, Objective-C, Apple Xcode, SwiftUI and react native collaboration, which helps me coordinate Android Development with ios developer teams. As an android developer kotlin, I work alongside react native, flutter developer and web developer teams, and understand JavaScript, React, PHP, Node.js, WordPress and full stack developer needs. This makes me an Android App Developer who bridges backend, frontend and app developer ios android teams for faster delivery. 🦾 As an Android Developer and ai mobile app developer I've improved onboarding flows, increased conversion by 16% and reduced crash rates by 40%. As an Android Developer, a Mobile App Developer for Android Development, I prioritize code quality and measurable results. I am a mobile application developer experienced in Android App Development, Kotlin, Java and Firebase, and a Mobile Developer who collaborates with android game developer, ios developer, flutter developer, react native and ios development teams. As an android developer kotlin, Android App Developer and Mobile Developer, I'm comfortable on ai mobile app developer and ai chatbot developer projects, and coordinating with bubble io certified developer mobile app specialists, swift mobile developer collaborators and figma mobile app handoffs - not only for Android Development and Mobile App Development. 🏁 As a Mobile Developer and Android Developer I communicate clearly, meet predictable timelines and value transparency. I work as android game developer, Android App Developer, mobile app developer in Ukraine - mobile app developer ukraine - and full stack mobile developer, delivering Android Development, Mobile App Development and Mobile Developer support for startups, including android app publisher and android tv app builds. Every android developer kotlin engagement follows the same Android Development and Mobile App Development discipline, and every android app developer milestone gets reviewed against that same Android Development bar. Competitive advantages of my Android Development as a Mobile App Developer: Clear Communication, Committed to Quality, Collaborative. As a Mobile Developer you get faster app performance, lower crash rates and higher retention. 🔑 Stack: Android, android developer kotlin, Android App Developer, Android App Development, Kotlin, Java, Jetpack Compose, Firebase, RESTful APIs, Android SDK, Swift, ios development, Objective-C, Apple Xcode, SwiftUI, react native, JavaScript, React, PHP, Node.js, flutter developer, android developer kotlin, android game developer, full stack developer, ios developer, web developer, mobile application developer, app developer ios android, blockchain development, ai mobile app developer, bubble io certified developer mobile app, Android Development, mobile app design, Mobile Developer, mobile application developer, uxpin, data entry, Android Smartphone. If you need a dependable Android Developer, Android App Developer or Mobile App Developer to lead your next Mobile App Development project as a Mobile Developer, I'm ready - as an android developer kotlin, Mobile Developer and Mobile App Developer who treats every Android Development and Mobile App Development milestone with care, with room for mobile app marketing input along the way, and an android developer kotlin mindset on every release

👋 Full Stack Developer (React, Node.js, TypeScript) for SaaS platforms, MVPs, and two-sided marketplaces. Part of a full-cycle delivery team - on Upwork since Sep 2010, 14 years in, 300+ contracts shipped, $700K+ earned, 100% Job Success, Top Rated. You get one developer who owns the whole system, plus an agency bench behind her. 💡 Hiring a full stack developer should not mean hiring a React developer and a Node developer in one body. The value is connection: I design how React, the Node.js backend, the database, and business logic move together from day one, so the front end never guesses what the backend means and the backend never returns data the front end does not use. Across 150+ products, that is what keeps React and Node from drifting apart. 🎯 WHAT YOU GET ➜ One accountable full stack developer who scopes honestly, gives a realistic estimate, and ships production-ready code - not two separate implementations stitched together. ➜ A web developer and backend developer in one: I diagnose and fix root causes (slow Node endpoints, CORS and auth errors, dropped env vars, broken React + Node integration), optimize performance, and deliver seamless integration. ➜ A team behind me. If the project grows past one developer, we scale without handing you off to strangers (19,765 hours of high-quality coding delivered). ➜ SaaS: multi-tenant architecture, billing and subscription logic, admin tools, webhook handling, auth and permissions - built for growth in e-learning, real estate, healthcare, fintech, and mobility. ➜ Marketplaces: Stripe Connect flows, booking and availability logic, operator dashboards, multi-role permissions, and complex search, designed as one workflow (buyer, seller, payments, operations). ➜ Backend developer work: REST API design, Express and NestJS services, PostgreSQL and MongoDB data modeling, Redis, event-driven and serverless functions, AWS and Vercel deploys. ➜ Existing codebases: I audit for stability, performance, and code quality, then make step-by-step improvements - no rebuild unless it is truly necessary. ➜ MVPs: a typical V1 ships in 5-6 weeks. One early build I helped ship went on to raise $3M. ➜ Front end: I turn UX designer handoffs into pixel-accurate, responsive UI - React Query strategy, shared TypeScript types, and state that matches the API. 🤖 I use AI coding tools the right way: faster scaffolding, migration prep, and reviews, while architecture, security, data modeling, and API contracts stay human-judged. As a JavaScript developer and software developer at core, I also take python developer work for backend services or data scripts when a project needs it. 🧩 Stack: React, Node.js (nodejs), TypeScript, Express, NestJS, PostgreSQL, MongoDB, Redis, Stripe, AWS, Vercel, Docker, CI/CD. 📊 14 years on Upwork ▪ 300+ contracts ▪ $700K+ earned ▪ 100% Job Success ▪ Top Rated ▪ 150+ products live ▪ 50+ countries ▪ 5,000+ end users on delivered platforms ▪ one MVP scaled to a $3M raise. Roles I take: full stack developer, full stack web developer, react developer, node developer, nodejs developer, backend developer, javascript developer, web developer, software developer, full stack react node developer. 📩 Need a full stack developer for a SaaS platform, marketplace, custom web app, or MVP -- or a backend developer to fix, optimize, and ship an existing React + Node system? Send a message with what you are building and I will give you a direct, practical view of what is involved, fixed-price or hourly.

I help businesses save money and accelerate development by working up to three times faster using AI-assisted workflows. By combining AI-driven tools with my experience as a full-stack React developer, I streamline both frontend and backend work so teams can focus on product strategy instead of repetitive tasks. I build scalable, high-performance apps with React, Next.js, Supabase, and Node.js (NestJS), delivering reliable end-to-end solutions for SaaS and AI-powered products-faster, without sacrificing maintainability. 🚀 I’ve been working as a Full Stack Developer React for more than 10 years, and during this time I’ve successfully delivered 70+ projects as a Full Stack Developer React - from MVPs to complex SaaS and AI-driven platforms. My experience as a Full Stack Developer React allows me to design systems that scale end-to-end, stay maintainable, and don’t require painful rewrites later. 🤖 During this time, I frequently integrate Node.js and NestJS on the backend with React and Next.js on the frontend, creating seamless end-to-end solutions for SaaS and AI-powered applications. I focus on building modular architectures that allow teams to scale quickly, implement real-time data features, and maintain high performance under load. By combining frontend and backend expertise, I ensure that both user interfaces and server-side systems work efficiently together, providing clients with faster deployment cycles and robust, maintainable products. Additionally, I optimize database interactions, API communications, and service integrations so SaaS platforms remain reliable as they grow. 🌍 As a Full Stack Developer React, I’ve built long-term partnerships with clients from the US, Canada, and Australia, supporting SaaS and AI products through multiple growth stages. My work as a Full Stack Developer React consistently improves Core Web Vitals, load times, SEO, and user engagement. ⚛️ On the frontend, as a Full Stack Developer React, I specialize in React and Next.js using TypeScript and JavaScript. I convert Figma designs into pixel-perfect, production-ready interfaces 🎨 using Tailwind CSS, SCSS, CSS Grid, and Flexbox. 🖥️ As a Full Stack Developer React working with Next.js, I use SSR, SSG, CSR, and the App Router, following SEO and performance-first architecture. Performance optimization is a core part of my work as a Full Stack Developer React, including lazy loading, code splitting, and image optimization ⚡. 🔗 On the backend, as a Full Stack Developer React, I work with Node.js using NestJS to build scalable APIs and services. I have hands-on experience designing REST APIs, authentication systems (JWT, OAuth), working with databases (MongoDB, SQL), and integrating third-party services like Stripe 💳 - ensuring clean and reliable frontend-backend communication. 🤖 As a Full Stack Developer React, I also work with SaaS and AI-powered features, including integrations with AI services, building data-driven UIs, and creating responsive interfaces for intelligent applications. 👥 I provide consulting for teams looking for a Full Stack Developer React, helping improve architecture, performance, code quality, and development workflows. My experience allows me to identify bottlenecks early and prevent technical debt. 🧪 I support testing and reliability using Jest, Cypress, and Testing Library. As a Full Stack Developer React, I focus on scalable, reusable codebases that are easy to maintain and extend. 🎓 I hold the Meta Front End Developer Professional Certificate, strengthening my expertise as a Full Stack Developer React in modern frontend architecture, performance, and scalable applications. ✅ What I can help you with As a Full Stack Developer React / React Next.js / React Node.js Developer, I can help you with: ✔ Full Stack development (React + Next.js + Node.js with NestJS) ✔ Building SaaS and AI-powered web applications ✔ Frontend architecture and scalable UI development ✔ Backend API development with Node.js and NestJS ✔ Performance optimization & Core Web Vitals ⚡ ✔ Authentication systems (JWT, OAuth) ✔ Stripe integrations 💳 ✔ Real-time and data-driven applications ✔ Refactoring and scaling existing codebases ✔ Consulting and technical guidance 🛠 My process 1️⃣ You share your product goals or challenges 2️⃣ I analyze architecture, performance risks, and scope 3️⃣ We align on priorities, timeline, and expectations 4️⃣ You receive regular updates (daily or weekly) 5️⃣ Final delivery, testing, and post-launch support 🚀 📩 If you’re looking for a Full Stack Developer React who understands Next.js, Node.js with NestJS, SaaS, and AI - click Invite and let’s discuss your project. Best regards, Ivan Zinchenko

For over 13 years, I’ve worked as a mobile app developer, React Native developer, full stack developer, and web developer, delivering more than 200 successful products for startups, enterprises, and growing businesses. If you’re looking for a reliable mobile app developer who can build fast, scalable applications from backend to frontend, you’re in the right place. Click on my profile and let’s get started! 😉 As a React Native developer, Expo developer, NodeJS developer, and full stack developer, I build high-performance mobile applications for iOS and Android while developing powerful backend systems with Node.js and modern web technologies. Whether you need an MVP, a production-ready mobile app, or a complete product ecosystem, I can handle the entire development process. I’ve worked as a mobile app developer, React Native developer, Flutter developer, and web developer across finance, healthcare, logistics, AI, education, marketplaces, and SaaS. My experience includes customer-facing mobile apps, enterprise platforms, dashboards, admin panels, APIs, and scalable backend infrastructure. 📱 Mobile App Development Expertise 🚀 Mobile App Developer: Full-cycle mobile app development from discovery and architecture to deployment and long-term support. 🚀 React Native Developer: Building scalable cross-platform mobile applications using React Native and Expo for iOS and Android with near-native performance. 🚀 Flutter Developer: Developing modern cross-platform applications with Flutter for businesses that prefer Google’s mobile framework. 🚀 Expo Development: Building and maintaining Expo applications, implementing OTA updates, push notifications, authentication, camera, location services, and native modules. 🚀 Full Stack Developer: Delivering complete products by combining React Native frontends with NodeJS, Node.js, Firebase, Laravel, and .NET backends. 🚀 Web Developer: Building responsive web applications, admin dashboards, internal tools, landing pages, and SaaS platforms using modern JavaScript frameworks. 🚀 Backend Development: Designing REST APIs, GraphQL APIs, WebSockets, authentication systems, payment integrations, cloud services, and scalable server architecture with NodeJS and Node.js. 🚀 API Integration: Connecting mobile applications with third-party APIs including Stripe, Firebase, Google Maps, OpenAI, Twilio, and custom backend services. 🚀 Testing & QA: Device testing, regression testing, performance optimization, crash monitoring, and compatibility testing across Android and iOS. 🚀 Deployment: Publishing applications to the Apple App Store and Google Play while managing CI/CD pipelines, releases, and updates. 💼 Recent Mobile Development Project 🚕 As a React Native developer and full stack developer, I recently built a large-scale delivery ecosystem consisting of three connected mobile applications. The platform includes a logistics management app, an organization portal for managing deliveries and customers, and a driver application with GPS navigation, real-time tracking, messaging, dispatching, payment processing, and live synchronization. The backend was built with Node.js, delivering high scalability and real-time communication across the entire platform. 🛠️ Tech Stack Mobile: React Native, Expo, Flutter Frontend: React, Next.js, TypeScript Backend: NodeJS, Node.js, Express.js, NestJS, Laravel, .NET, Firebase Databases: PostgreSQL, MySQL, MongoDB, Supabase, Firebase APIs: REST API, GraphQL, WebSockets Cloud: Firebase, AWS, Google Cloud Deployment: App Store, Google Play, Vercel, Docker ✅ Why Hire Me? 📱 Experienced Mobile App Developer: 200+ successful products delivered across startups and enterprise companies. 📱 Senior React Native Developer: Extensive experience building scalable React Native and Expo applications for iOS and Android. 📱 Full Stack Developer: I build both frontend and backend, eliminating communication gaps between developers. 📱 NodeJS & Node.js Expert: Strong experience creating scalable APIs, backend services, authentication systems, and cloud infrastructure. 📱 Flutter Developer: Available for both React Native and Flutter projects depending on your business needs. 📱 Web Developer: Experienced in building SaaS platforms, dashboards, marketplaces, and responsive web applications. 📱 Scalable Architecture: Clean, maintainable, reusable code that supports long-term product growth. 💬 If you’re looking for a mobile app developer, React Native developer, Expo developer, NodeJS developer, full stack developer, Flutter developer, or web developer, I’d be happy to help. Whether you need a new mobile application, a scalable backend with Node.js, an existing React Native app improved, or a complete end-to-end product, let’s build something exceptional together.

I have been working as developer since 2000. I have developed a wide range of software. Skills: Java, Kotlin, Jetpack Compose, Android, Flutter, Dart, IOS, Swift, Obj-c. SQL/MySQL/SQLite, Delphi, C++, C#, TCP/UDP, DirectShow, DVR/NVR board, CCTV/IP cameras, Hikvision/Dahua, I/O devices, SIP/VOIP/WEBRTC, HTML/PHP/jQuery/AJAX/JavaScript/CSS. Ionic framework. AWS/Zoho/Apache.

📈 My last landing page increased conversions by 60% in the first month. A healthcare monorepo app I optimized now loads 3x faster and reduced bugs by 70%. 100% Job Success | ⭐⭐⭐⭐⭐ Feedback | Clients keep coming back for more 🧑‍💻 4+ 𝘆𝗲𝗮𝗿𝘀 of proven experience building fintech, landing websites, SaaS, and healthcare products. Clients value me for speed, proactive communication, and results that require minimal revisions. ⭐️ Max Prosperi: "⭐⭐⭐⭐⭐ Nicholas (Mykola) jumped into a complex codebase with minimal onboarding and delivered high-quality work at impressive speed. Clear communication, thoughtful commits, reliable delivery." ⭐️ Aleks Zimak: "⭐⭐⭐⭐⭐ Nicholas (Mykola) quickly turned complex Figma designs into clean, responsive code. His proactive approach, attention to detail, and fast delivery made collaboration seamless. Highly recommend!" ⭐️ Ilan Cohen: "⭐⭐⭐⭐⭐ "Excellent freelancer! I worked with Mykola on securing my website access, as I had a mess between Github, servers, Lovable access, and more. Mykola reordered everything very quickly, and thanks to him, I can work again on my site!" 🛠 What I deliver: • Responsive SPAs & dashboards from Figma • SEO-ready Next.js apps (App Router) • Cross-platform mobile apps (React Native) • Fintech/Web3 integrations (Stripe, EexSwap, EexWallet) • APIs, authentication, WebSockets, analytics • Clean code, tests, error handling & i18n 📌 Workflow: 1. Requirement analysis & consultation 2. UI/UX implementation with clean code 3. Development in scalable architecture 4. Weekly updates & proactive feedback 5. Testing, optimization & deployment 🔥 If you need a reliable frontend partner with proven results — click "𝗜𝗻𝘃𝗶𝘁𝗲" on my profile, and let’s build something great. Best regards, Mykola S. Front-End Development React, Front-End Development Next.Js, Front-End Development TypeScript, Front-End Development JavaScript, Front-End Development Tailwind CSS, Front-End Development Chakra UI, Front-End Development MUI, Front-End Development Mantine, Front-End Development Shadcn UI, Front-End Development Ant Design, Front-End Development Bootstrap, Front-End Development Responsive Design, Front-End Development Landing Pages, Front-End Development Dashboards, Front-End Development Admin Panels, Front-End Development SaaS Apps, Front-End Development Fintech Apps, Front-End Development Web3 Apps, Front-End Development Healthcare Apps, Front-End Development Time Tracking Apps, Front-End Development Multilingual Websites, Front-End Development i18next, Front-End Development Accessibility, Front-End Development SEO-Ready Apps, Front-End Development Server-Side Rendering, Front-End Development Static Site Generation, Front-End Development App Router Next.Js, Front-End Development State Management, Front-End Development React Query, Front-End Development Redux Toolkit, Front-End Development Zustand, Front-End Development Context API, Front-End Development Authentication, Front-End Development JWT Auth, Front-End Development NextAuth.Js, Front-End Development API Integration, Front-End Development REST API, Front-End Development GraphQL, Front-End Development Supabase, Front-End Development Firebase, Front-End Development PostgreSQL, Front-End Development MongoDB, Front-End Development Prisma ORM, Front-End Development MySQL, Front-End Development Real-Time Apps, Front-End Development WebSocket, Front-End Development SocketIO, Front-End Development Stripe Integration, Front-End Development Payment Gateway, Front-End Development Subscription Billing, Front-End Development Crypto Wallet, Front-End Development E-Wallet, Front-End Development Blockchain Frontend, Front-End Development Smart Contracts, Front-End Development dApp UI, Front-End Development Fintech Multicurrency, Front-End Development Data Visualization, Front-End Development Recharts, Front-End Development Chart.Js, Front-End Development Analytics Dashboards, Front-End Development Reports System, Front-End Development Jest Testing, Front-End Development Cypress Testing, Front-End Development React Testing Library, Front-End Development Unit Testing, Front-End Development E2E Testing, Front-End Development Error Boundaries, Front-End Development Performance Optimization, Front-End Development Lighthouse Optimization, Front-End Development Lazy Loading, Front-End Development Image Optimization, Front-End Development CDN Integration, Front-End Development AWS EC2, Front-End Development Vercel, Front-End Development Netlify, Front-End Development CI/CD GitHub Actions, Front-End Development Monorepo Nx, Front-End Development Turborepo, Front-End Development Module Federation, Front-End Development Framer Motion, Front-End Development Mobile Apps, Front-End Development React Native, Front-End Development Expo, Front-End Development Tamagui, Front-End Development React Navigation, Front-End Development Cross-Platform Apps, Front-End Development App Store, Front-End Development Google Play, Front-End Development