📈 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

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.

💻 Senior Full Stack Developer ⚡ 5+ Years of Experience 🚀 10+ Successfully Delivered Projects 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 ⚛️ React.js ▲ Next.js 📘 TypeScript 🔄 Redux 🕸️ GraphQL 🔌 REST API 🎨 HTML5 / CSS3 / SCSS 🧩 Material UI / Bootstrap 📦 Webpack 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 🟢 Node.js 🏗️ NestJS / Express.js 🗄️ PostgreSQL / MongoDB 🔐 JWT Authentication ⚡ SocketIO ☁️ AWS / Firebase / Heroku 🔗 REST APIs & Integrations 𝗠𝗼𝗯𝗶𝗹𝗲 📱 React Native 🚀 Expo / React Native CLI 🍎 iOS / 🤖 Android 🧪 TestFlight / Firebase Distribution 🛠️ Android Studio / Xcode / VSCode

🚀 iOS Developer | Swift, SwiftUI & Native Mobile App Development 𝟮𝟬+ 𝗮𝗽𝗽𝘀 launched, with 𝟭𝟬 𝘆𝗲𝗮𝗿𝘀 of experience building native iOS and macOS apps. 🤖 Using Codex and Claude Code to 𝗱𝗲𝗹𝗶𝘃𝗲𝗿 𝗳𝗮𝘀𝘁𝗲𝗿 and 𝗿𝗲𝗱𝘂𝗰𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗰𝗼𝘀𝘁𝘀, with every change reviewed to ensure 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻-𝗾𝘂𝗮𝗹𝗶𝘁𝘆 code. As an iOS Developer with 9+ years of experience in Native Mobile App Development, I specialize in building iOS applications built with Swift, SwiftUI, UIKit, and Objective-C. I work on production systems with a strong focus on performance, stability, maintainability, and delivering a polished user experience. 💡 Why clients work with me ✅ Native iOS Developer focused exclusively on Apple platforms ✅ 9+ years of hands-on iOS development experience ✅ Strong experience with large and legacy codebases ✅ Production-focused ✅ Clean, scalable, and maintainable architecture ✅ Fast iteration using AI-assisted development workflows ✅ Reliable communication and long-term support I’m comfortable working on both MVPs and long-term products, including apps with complex business logic, real-time features, offline-first architecture, CloudKit synchronization, and App Store releases. My expertise includes: ✔️ Building native iOS apps from scratch ✔️ Improving and maintaining existing apps ✔️ Fixing crashes, bugs, and unstable behavior ✔️ Refactoring legacy UIKit / Objective-C codebases ✔️ Migrating apps to SwiftUI ✔️ Performance optimization & debugging ✔️ API integrations, subscriptions & push notifications My technical expertise includes Swift, SwiftUI, UIKit, Objective-C, CoreData, SwiftData, CloudKit, StoreKit, Firebase, AWS, REST APIs, RevenueCat, AppsFlyer, real-time systems, subscriptions, and push notifications. Have an iOS app to build, improve, or fix? Let’s discuss your goals and how I can help.

I help startups and engineering teams make better technical decisions, build reliable systems, and improve delivery without unnecessary complexity. I am a hands-on technical leader, software architect, and former CTO with 20+ years of experience across backend engineering, cloud infrastructure, DevOps, integrations, AI-enabled development, and engineering management. My strongest fit is with founders or teams that need more than an ordinary developer: architecture judgment, technical direction, code-level credibility, delivery discipline, and the ability to step in directly when needed. Upwork record: 100% Job Success $200K+ earned 7,000+ hours billed Typical work I handle: Fractional CTO / technical leadership for startups Architecture review and system design Backend systems with Python, FastAPI, PostgreSQL, Go, and JavaScript AWS / GCP infrastructure, Docker, Kubernetes, CI/CD, and DevOps AI integration and practical agentic coding workflows Cloud cost reduction and infrastructure stabilization Legacy codebase review, refactoring plans, and technical debt reduction Engineering process, code review standards, hiring support, and team structure Technical due diligence for founders, investors, or acquisition reviews Integration consulting across APIs, internal tools, cloud services, and automation systems I work best when the goal is not just to “write code,” but to reduce technical risk, make the architecture clearer, improve execution speed, and help the business avoid expensive engineering mistakes. Engagements can be short advisory sessions, fixed-scope audits, architecture/design reviews, or ongoing fractional technical leadership. No marketing, no growth hacking, no vague transformation consulting — only software architecture, engineering execution, infrastructure, integrations, and technical operations.

My clients emphasized my ability to quickly dive into projects and deliver results aligned with requirements and acceptance criteria within the required timeframe. Greetings! I am a Senior front-end developer with a proven track record in React.js, Angular, JavaScript, HTML, and CSS. Finished 39+ projects. 5500+ happy hours, full of challenging tasks, crucial moments, and fun. From an idea to the final launch, I've got you covered. Please feel free to write to me before the project. ⭐⭐⭐⭐⭐ "Vitalii is a person to cooperate with for those who care about their time, money, quality of work, deadlines, and want to avoid hustling. I was impressed by his ability to dive into the context of tasks, finding the right approach for a particular task, asking the right questions, and providing updates on a daily basis. Everything went smooth from the very first message to the final result. We were able to rump up the developing process, improve the code base without the need for big rewrites, and all within just a week with Vitalii's help. His architecture skills and experience have helped us to find the right way for developing the last milestone which was quite tricky and complicated." - Daniel Turczański, Entrepreneur, JQL Search Extensions. Upd: 25.07.25 Why you should choose me over other front-end developers: 🏅 Top Rated Plus Front-End Developer - ONLY 3% on Upwork 🎯 All projects have successfully finished with five-star feedback ✅ Certificates from Microsoft and Udemy ⚡ Immediate answers to any contract/invite in less than three hours ⌚ Available for RUSH projects and calls You will get more than just a front-end developer: - Top-notch experience in Front-end development (React, Angular, JavaScript, Typescript, HTML, CSS) - Proven soft and hard skills - Ability to quickly dive into the project and deliver results within a minimum time frame - 24/7 availability for communication and support - Hustle-free environment for your ideas - An individual deeply committed to your success and adding value to your enterprise --- Keywords: Front End Developer, Front End Development, Front End, React, React.js, TypeScript, JavaScript, JS, Redux, Redux Toolkit, React Hook Form, React Query, React Table, React Router, React Bootstrap, Material UI, MUI, Angular, Angular.js, Angular 8, Angular 9, Angular 10, Angular 11, Angular 12, Angular Material, Ng Bootstrap, NgRx, RxJS, Ng cli, Nx cli, Next.js, SSR, SSG, SWR, App Router, Pages Router, Tailwind CSS, Tailwind, Radix UI, Shadecn UI, Styled Components, CSS Modules, HTML, HTML5, CSS, CSS3, Twitter Bootstrap, Bootstrap, Sass, Less, Scss, Webpack, Vite, Vite.js, Vercel, Cloudflare Pages, API, REST, Graphql, Jira, Asana, Shortcut, GitHub, BitBucket, GitLab, Figma, Zeplin, Adobe XD, Landing Page, SaaS, MVP, PoC, Startup, Product, Enterprise.

Hi, I'm a full-stack developer with 6+ years of experience building fast, secure, and scalable web applications using WordPress, Laravel, React.js, Vue.js, and Node.js. I’ve worked with clients across different industries helping them go from idea to launch, fix broken systems, or simply speed up their product development. I’m equally comfortable working on custom backend logic, building APIs, or crafting pixel-perfect frontends. Here’s what I usually work on: WordPress: Custom themes, plugins, site optimization, ACF, Elementor, Bricks Laravel: Backend dashboards, REST APIs, multi-user systems, admin panels React.js & Vue.js: SPAs, dashboards, booking systems, dynamic forms Node.js: API development, server-side logic, real-time updates, integrations Third-party APIs, bug fixing, performance tuning, long-term maintenance I prefer writing clean, reusable code and always keep performance and user experience in mind. Whether you need someone to take care of an entire project or jump into an existing one, I’m ready to help. Let’s chat and see how I can make your work easier.

🚀 Senior Laravel Developer | PHP Developer | Full Stack Developer | Vue.js Developer I help startups, SaaS companies, and growing businesses build scalable web applications, SaaS platforms, backend systems, and high-performance APIs using Laravel, PHP, Vue.js, JavaScript, and cloud technologies. For 7+ years, I’ve worked as a Laravel Developer, PHP Developer, CodeIgniter Developer, and Full Stack Developer delivering secure, scalable, and production-ready applications for SaaS, ecommerce, CRM, ERP, fintech, education, and enterprise platforms. I specialize in full stack development — from scalable backend architecture and REST API development to responsive frontend interfaces and cloud deployment. 💡 Why clients hire me ✔ 7+ years of full stack development experience ✔ Built and optimized 50+ web applications & SaaS platforms ✔ Strong Laravel, PHP, Vue.js & JavaScript expertise ✔ Scalable SaaS architecture & API-driven systems ✔ Clean, secure, maintainable code ✔ Fast communication & reliable delivery ✔ Long-term support and scalable business solutions Over the years, I’ve developed: • SaaS platforms • CRM & ERP systems • Ecommerce & marketplace platforms • Booking & scheduling systems • Enterprise dashboards & admin panels • API-driven web applications • Cloud-hosted business platforms • Automation & internal management systems ⚙️ Backend Development | Laravel, PHP & Scalable APIs As a Senior Laravel Developer and PHP Developer, I specialize in building scalable backend systems, high-performance REST APIs, and cloud-ready SaaS applications with clean, maintainable architecture. Over the years, I’ve developed everything from custom business platforms and multi-tenant SaaS systems to enterprise dashboards, ecommerce backends, and API-driven applications handling complex workflows and large-scale data. My backend experience includes working extensively with Laravel, PHP, CodeIgniter, and Symfony to build secure authentication systems, payment integrations, queue-based background processing, and scalable microservices architecture. I regularly develop and integrate REST APIs, connect third-party services like Stripe and PayPal, and optimize backend performance for speed, stability, and long-term scalability. As a Backend Developer and Full Stack PHP Developer, I focus on writing clean, production-ready code that supports fast-growing applications, reliable infrastructure, and seamless frontend-to-backend communication. 🎨 Frontend Development | Vue.js, JavaScript As a Vue.js Developer and Frontend Developer, I create responsive, scalable, and modern frontend applications with clean UI architecture and optimized user experience. Frontend technologies: • Vue.js • JavaScript / jQuery • HTML5 / CSS3 • Tailwind CSS • Bootstrap • Responsive UI Development • Dashboard Development • SaaS Frontend Development Built frontend systems for: • SaaS dashboards • CRM interfaces • Admin panels • Analytics systems • Marketplace applications • Business management platforms 🗄️ Database Development & Optimization Strong experience designing scalable database architecture and optimizing high-traffic applications. Technologies: • MySQL • PostgreSQL • MariaDB Focus areas: • Query optimization • Indexing strategies • Performance tuning • Large-scale data handling • Scalable database architecture ☁️ Cloud & DevOps Experienced with production deployments, cloud infrastructure, and scalable SaaS environments. Cloud platforms: • AWS • Google Cloud Platform (GCP) • Microsoft Azure Experience includes: • Cloud deployment • CI/CD pipelines • Docker environments • Server optimization • Secure production deployment 🚀 SaaS & Enterprise Development I help businesses build scalable SaaS applications, enterprise systems, and custom web platforms optimized for growth, performance, and maintainability. Core expertise: • SaaS Development • Enterprise Software Development • Marketplace Development • CRM & ERP Development • Booking System Development • Ecommerce Development • Custom Web Application Development • Scalable Web Application Development 📈 Results Delivered ✔ Improved application performance by 40-70% ✔ Built scalable SaaS platforms supporting thousands of users ✔ Integrated 30+ third-party APIs and payment systems ✔ Optimized legacy Laravel & PHP systems into scalable architectures ✔ Delivered MVP platforms in 4-8 weeks for startups 💬 If you need a Laravel Developer, PHP Developer, Vue.js Developer, Full Stack Developer, Backend Developer, SaaS Developer, or REST API Developer, I can help you build secure, scalable, and modern web applications tailored to your business goals.

🟨 Tested 20+ web & mobile products before release 🟨 Helping teams catch bugs early and avoid costly fixes later 🟨 Reduce production bugs by 50% I’m one of those QA tester specialists who doesn’t just “run tests” I look at the product like a real user and break it before your users do. What I do as a QA tester Manual QA tester / Software QA testing ✔️ Full-cycle software testing: regression, smoke, acceptance ✔️ Web testing, app testing (iOS / Android), cross-browser testing, quality assurance software ✔️ QA tester focused on real user flows, not just checklists ✔️ Clear bug reports in Jira QA automation / Automation tester ✔️ QA automation using Cypress and Playwright ✔️ Automation tester building stable end-to-end tests ✔️ QA automation engineer improving or rebuilding test coverage ✔️ Integration with CI (GitHub Actions, pipelines) ✔️ API testing with Postman and other tools I’m a QA engeneer (manual tester and automation tester) who works with products where bugs cost real money, SaaS platforms, marketplaces, business tools. My Tech Stack: ✔️ Cypress, Playwright, automation selenium Selenium, WebdriverIO ✔️ JavaScript, TypeScript, Python, Java ✔️ Postman, SoapUI ✔️ Jira, TestRail, X-Ray ✔️ BrowserStack, Sauce Labs ✔️ MySQL, PostgreSQL ✔️ OpenAI API, LangChain, HuggingFace I am a senior qa engineer, (automation engineer, qa automation engineer include manual testing) who focuses on modern, production-ready stacks and don’t take projects who need wordpress developer, react developer, front-end developer, full stack developers, project managers, python developer, react native developer, software developer, java developer, software product manager, Swift, python django, Angular, WordPress, Laravel, brazil, PHP, Vue, or Webflow, jest, design, gps, flutter, link building, copywriter, website traffic because my main focus is always on QA testing and product quality. Have a product that needs a QA tester or QA automation engineer? Click "Invite", send a short description, and I’ll show you where your product can break - before your users do