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I’m Prokhor, a Senior Full Stack developer with 6+ years of experience building applications for startups, product companies, and growing businesses. As a Full Stack developer, I work across both frontend and backend development, helping clients build products from scratch, improve existing systems, and support long-term growth. ✅ Experienced Senior Engineer turning complex requirements into production-ready software ✅ AI-Native Workflow Specialist delivering high-quality results with exceptional speed I’m a business-oriented software engineer and senior full stack developer. As a full stack software engineer, I help startups and SMBs turn their ideas into valuable digital products. Fast, stress-free, and with full delivery ownership. I work as a React developer / Front end developer (Front end developer React) and a backend developer on node.js (node) - specializing in high-performance Next.js and Node.js enterprise setups. Day-to-day I build full stack node.js react products. ⭐⭐⭐⭐⭐ "Excellent communication, deep technical knowledge, and proactive problem-solving. Delivered the integration ahead of schedule." - Recent Client Feedback ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 which I have expertise as a Full stack node.js react developer ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▸ Backend: Node.js, NestJS, Koa, Express, Fastify, TypeScript, RESTful APIs, GraphQL ▸ Frontend: React, Next.js, TailwindCSS, VueJS, HTML, CSS, Redux ▸ Databases: MongoDB, PostgreSQL, Redis, MongoDB, MySQL, ClickHouse, Relational & NoSQL systems ▸ DevOps & Cloud: AWS, Azure, Vercel, CI/CD, Google Cloud, Render ▸ Tools & Workflows: AI-assisted development, Claude Code, Cursor, Git, Webpack ▸ CMS: Payload, Contentful, Strapi I deliver end-to-end web apps as a full stack react developer, combining clean UI work with reliable backend architecture. On the server side, I work as a full stack developer node / full stack developer node js, building secure APIs, complex JWT/OAuth authentication flows, and data sync layers; on the client side, I build full stack react interfaces and high-performance full stack react js components. When a product requires a unified stack, I seamlessly connect frontend and backend using react node, ensuring features are scalable, secure, and fully production-ready. When needed, I step in to manage development workflows and lead technical execution: from database design, migrations, and performance tuning to secure third-party integrations. I have deep experience handling advanced integration challenges, resolving Content Security Policy (CSP) conflicts, managing Cookiebot compliance, and implementing robust frontend/backend architectures. I’ve also built custom statistical analysis tools, matching platforms, and complex analytical systems. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈 𝐡𝐚𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡 as Full stack Developer React Node ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▸ International Logistics & Supply Chain ▸ FinTech & Banking Integrations ▸ Real Estate & Property Management ▸ Gaming Analytics & Statistics Platforms ▸ SaaS & Custom Business Automation I ship modern website work as a web developer / full stack web developer / full stack website developer. I collaborate closely with UI/UX teams, acting as a technical partner to ensure design requirements match high-performance frontend engineering. If you need a reliable full stack engineer who can take full ownership from idea → production, let’s connect. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📩 LET’S CONNECT ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Message me to discuss your project requirements. No pitch decks, just pure engineering value and clean execution. 𝐖𝐚𝐫𝐦 𝐑𝐞𝐠𝐚𝐫𝐝𝐬!

🟢 Available for ongoing hourly work I build AI automation and support systems for businesses operating under EU rules (GDPR / EU AI Act). Most recently I shipped an AI patient-support assistant for a network of healthcare clinics in Belgium - multilingual, on web and WhatsApp, with appointment booking and live-agent handoff. Mostly React, Next.js and Node.js: SaaS products, CMS-driven platforms, dashboards and business-critical web apps. What I can help with: → AI support agents: RAG pipelines over your own docs, grounded answers, live-agent handoff → AI agents and automations: OpenAI / Claude, LangChain, vector search, WhatsApp and Telegram → Payload CMS development: custom collections, access control, Next.js integration, migrations → Statamic and headless CMS setup, cleanup or rescue of an existing install → Next.js / React apps: SaaS dashboards, admin panels, business-critical web apps → Node.js APIs, backend logic and third-party integrations (Stripe, CRM, Google Sheets) → React Native apps for iOS and Android, including App Store and Google Play release → Website speed, Lighthouse and Core Web Vitals optimization → Legacy rescue: AngularJS upgrades, refactoring, taking over abandoned codebases → Technical audit with a clear roadmap before implementation Why clients work with me: • 10+ years of full-stack development experience • $100K+ earned on Upwork • 100% Job Success • Top Rated - consistently top-ranked talent on Upwork • Strong experience with long-term projects, legacy systems and existing codebases • I work async, communicate clearly and can take tasks from investigation to implementation • Comfortable working with US, UK, EU and CEE clients Recent work: ▪ Built a real estate platform with Payload CMS + Next.js and an AI listing parser (OpenAI) ▪ Built an AI support chatbot and CRM with Payload + Next.js + WhatsApp integration ▪ Built Next.js + Statamic CMS websites for business and healthcare clients ▪ Improved performance, forms, tracking and lead flow for existing websites ▪ Upgraded a large legacy Angular application to a modern version A good first step is usually a small technical audit or fixed-scope rescue sprint. I identify the highest-impact issues, explain what is worth fixing first, then continue with implementation or ongoing hourly support. Stack: Next.js, React, React Native, Node.js, TypeScript, Payload CMS, Statamic, Supabase, PostgreSQL, OpenAI, Claude, LangChain, RAG, vector databases, WhatsApp Business API, Stripe.

Senior full stack engineer for FinTech Products · Real-Time Dashboards · Legacy Migrations SENIOR FULL STACK ENGINEER When your trading dashboard lags, your legacy codebase blocks every sprint, or your team ships Excel instead of a real product — that's exactly the problem I've been solving for 12 years. My expertise knowledge domains are Fintech, Energy & Retailing. Transforming complex ideas into seamless, scalable web solutions - powered by React, Next.js, Node.js I've built and shipped production React/Next.js applications for HSBC, UBS, McKinsey, Sainsbury's, and Equinor — environments where slow code costs money and architecture decisions stick for years. ✅ 14+ SPAs and PWA built from scratch in regulated FinTech environments ✅ 5+ legacy migrations delivered (Backbone → React) without stopping product delivery ✅ Excel → Web App: replaced spreadsheet workflows for biggest UK retail company (30-person team, 1 year) ✅ Introduced TDD/BDD culture — from 0% to production-grade test coverage ✅ Real-time trading dashboards for Fixed Income & FX platforms WHO I WORK WITH → FinTech scaleups building trading tools, risk dashboards, or payment platforms who need a senior engineer — not a ticket executor → Enterprise teams with a React codebase that's become painful to ship → Companies replacing a critical Excel workflow with a real web product → Outsourcing vendors (Softserve, GlobalLogic, Luxoft-type) who need a battle-tested senior contractor for FinTech client accounts WHAT I BRING → React architecture that's designed to last, not just to demo → Full-stack ownership: React + Node.js + GraphQL + PostgreSQL + AWS/Azure → CI/CD, Docker, Kubernetes — I don't just hand off code, I ship it → Code reviews, mentoring, and engineering standards that stick → Small agency squad available: FE + Backend + DevOps for full-product builds DOMAINS FinTech · Oil & Energy · Retail · SaaS · Internal Tooling STACK React · TypeScript · Next.js · Node.js · GraphQL/Apollo · Redux PostgreSQL · MongoDB · AWS · Azure · Docker · Jest · Cypress · CI/CD If your biggest challenge right now is speed, architecture, or a migration — send a message. I'll tell you in 20 minutes if I can help. Transforming complex ideas into seamless, scalable web solutions - powered by React, Next.js, Node.js, and a decade of real-world results. Ready to elevate your project to the next level? No fluff, just smooth project delivery🏆 TECHNICAL SKILLS ✅ Frontend: React, Next.js, GraphQL, Redux, TypeScript, HTML5, CSS3, JSS, LESS/SASS , Wordpress Backend: Node.js, Python, Express, REST APIs Databases: PostgreSQL, MongoDB, Redis, SQL Cloud & DevOps: AWS (Lambda, DynamoDB, S3, API Gateway), Azure, Docker, Kubernetes, Jenkins, GitHub Actions Testing: Jest, Cypress, Selenium, react-testing-library, TDD, E2E Tools: Storybook, Lerna, BrowserStack, Vite, Webpack, CI/CD pipelines Full stack developer, JavaScript expert, Web Developer. (React, TypeScript, Node.js, Next.js) React, React Native, React.js, Mobile App Development, Crossplatform apps React Node.js Web Development Software Development GraphQL Web Application API Integration CSS Progressive Web App HTML Cloud Application API API Development MySQL PostgreSQL WordPress Artificial Intelligence Mobile App Development HTML5 Bootstrap Node.js, Full Stack Development, SaaS Development, API Development, FinTech, Retail-Tech, MVP, Payment Integration, CRM Integration, Software Architecture Web App Site SaaS Figma Re-Design Mobile Needed Application Expert Product projects Need Wireframe B2B Mockup Prototype Platform Existing Portal Talented Create Dashboard Required Looking New Develop Modern Conversion Build Finance Content Software Screens Graphic Brand interactive Android Help Homepage Marketplace High-Fidelity Frontend Fashion Medical MVP short longer term Work Research Information Architecture U/X Revamp Supplement Start-Up entertainment Custom Web Platform SaaS Ul Graphics Product Ul Animation Web Application Audit Dashboard Concept Mobile Angular iPad Ul Minimum Viable Product Concept UI/UX UI UX design User Interface Promo Adaptive User Interface platform design Landing Page Responsive Graphics & Ul Website User Experience InVision Axure, REST, REST API, Full-cycle Web, Full stack engineer, REST-API Integration, FinTech, Oil&Energy, Retail, SaaS Responsive Infographics design UX/UI Desktop Sketch Adobe WordPress Technology & IT Entertainment Business & Sales Marketing Advertising B2B B2C Consultancy Science Sport & Wellness Fashion & Beauty Apparel Nonprofit Startup Transport & Logistic Education Arts & Culture Design & Architecture Hospitality & Leisure Manufacturing Food & Drinks Travel Law SaaS DaaS Home Services Banking & Finance Real Estate Luxury Retail Healthcare & Medicine Professional Services Startup Start-up Small & Midsize SAP CRM ERP, API Integration, React Web App, React SPA, React PWA, Next.JS App, Node.js App, TypeScript Web Development, JavaScript Expert

"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 a versatile Full-Stack and AI Developer with 8+ years of experience building scalable, high-performance web applications and intelligent digital solutions. I specialize in both front-end and back-end development, combining modern JavaScript frameworks with Python, cloud infrastructure, and AI technologies to deliver full-fledged products. My tech toolkit includes React.js, Vue.js, Angular, Node.js, Python, FastAPI, MongoDB, PostgreSQL, and a strong command of AWS services, including Lambda, Cognito, Amplify, Generative AI, LLM, Tensorflow, Langchain and more. I’ve also worked on GPT-powered features, integrating AI models to create smarter, more responsive applications. ✅ Services Offered: Front-End Development Responsive, user-centric UI design with React, Vue, and Angular State management using Redux, Vuex, etc. Seamless API integrations (REST & GraphQL) Performance optimization and accessibility best practices Back-End Development Robust API and microservice development using Node.js, Express, and FastAPI Python-based back-end logic for data processing, automation, and API services Secure authentication/authorization systems and custom middleware Database design and optimization (MongoDB, PostgreSQL) Web scraping (scraped sites like EBay for product information with images) AI & GPT Integrations Custom GPT-3.5/GPT-4 integrations for automation, chatbots, and smart UI features Prompt engineering and fine-tuned AI workflows Back-end support for AI features, including caching and input sanitization Data pipelines (from scratch and using individual components, not by using services like databricks or airflow) Machine learning models, their tuning and data analytics (using libraries like Tensorflow, langchain, crewAI, PowerBI) Cloud Services & DevOps AWS Cognito for secure user authentication and identity management AWS Lambda for serverless backend logic and API endpoints AWS Amplify for fast, scalable full-stack deployment and hosting Containerization with Docker and orchestration using Kubernetes CI/CD pipelines for efficient development and delivery Full-Stack Solutions Full end-to-end development with MERN, MEVN, or Python + React stacks Third-party API integrations and real-time features (WebSockets, Pub/Sub) Scalable infrastructure on AWS, including EC2, S3, CloudFront, and RDS 💼 Why Work With Me? Client-Focused: I align my work with your business needs and project goals Results-Oriented: Clean, maintainable, high-performance code every time Reliable Communication: Regular updates, collaborative approach, and full transparency On-Time Delivery: I respect deadlines and take ownership of getting the job done right Let’s turn your ideas into reality. Whether you're building an MVP, enhancing an existing system, or integrating AI-driven features, I’m here to help. Let’s connect and talk about how I can bring value to your next project!

I build high-performance 3D product configurators for Shopify, eCommerce, and SaaS platforms using Three.js, WebGL, React, and custom backend integrations. Whether you need a Shopify product customizer, furniture configurator, jewelry configurator, product builder, or interactive 3D visualization tool, I can help transform complex products into engaging buying experiences that increase conversions and customer engagement. Over the last 11+ years, I have developed custom web applications, interactive WebGL experiences, and real-time 3D product configurators for brands, manufacturers, and online stores. WHAT I BUILD ✔️ 3D Product Configurators ✔️ Shopify Product Customizers ✔️ Product Personalization Tools ✔️ Furniture Configurators ✔️ Jewelry Configurators ✔️ Product Builders ✔️ Interactive 3D Product Visualization ✔️ Web-Based 3D Applications ✔️ Custom eCommerce Experiences ✔️ SaaS Configuration Platforms SHOPIFY & eCOMMERCE SOLUTIONS I develop custom Shopify experiences that allow customers to personalize products directly on product pages. FEATURES INCLUDE: ✔️ Real-time product customization ✔️ Color, material, and texture selection ✔️ Text engraving and personalization ✔️ Dynamic pricing ✔️ Variant management ✔️ Cart and checkout integration ✔️ Mobile-friendly configuration tools ✔️ Performance-optimized user experiences 3D & WebGL EXPERTISE My focus is creating fast, scalable, and maintainable 3D applications powered by modern web technologies. I specialize in: ✔️ Three.js ✔️ React Three Fiber ✔️ WebGL ✔️ React ✔️ Next.js ✔️ TypeScript ✔️ JavaScript ✔️ Node.js ✔️ Shopify APIs ✔️ WooCommerce Integrations ✔️ Firebase ✔️ REST APIs WHY CLIENTS HIRE ME ✔️ 11+ years of development experience ✔️ Strong communication and predictable delivery ✔️ Performance-focused architecture ✔️ Experience with complex customization workflows ✔️ Production-ready code built for long-term scalability ✔️ End-to-end implementation from concept to launch If you're looking for a Three.js developer, WebGL developer, Shopify customizer, or 3D product configurator expert, feel free to reach out. I'm happy to review your project, recommend the right technical approach, and help you build an interactive product experience that delivers real business results.