Yurii F.

🎁 Have an idea or a half-finished product? I'll send you a free roadmap and MVP estimate within 1 hour. ⭐ Full Stack Developer | Node.js Developer | React Developer | AI | 15+ years in software I am a Full Stack Developer and React Developer with 15+ years in software development. I build SaaS products, MVP launches, B2B portals and AI features as a Node.js Developer on the backend and a React Developer with React.js and Next.js on the frontend. Clients hire me when they need one Full Stack Developer who owns the whole product: the React.js interface, the Node.js API, the database, AWS deployment and the roadmap for what comes next. 📊 Experience in numbers ✔️ 15+ years of experience as a Full Stack Developer, React Developer and Node.js Developer ✔️ 100+ successful projects delivered for startups, SaaS companies and enterprise businesses ✔️ 30+ mobile applications developed, launched and maintained for iOS and Android ✔️ 20+ AI-powered products built with the OpenAI API, Claude API, AI chatbots, AI agents and RAG architecture ✔️ 60+ Firebase, Stripe, Maps, Authentication, Analytics and Payment integrations completed ✔️ Industries: SaaS, fintech and trading, e-commerce and logistics, manufacturing ERP and CRM, marketplaces, AI and Web3 ✅ What you get ✅ One Full Stack Developer for your whole web app: React.js frontend, Node.js backend, database and deployment ✅ A free project roadmap and a rough estimate within 1 hour after you share your brief ✅ Weekly demos, so you see working features and not status reports ✅ A team of 40 engineers behind me when your product needs to grow faster 🔧 How I work 1️⃣ Discovery call: goals, users and the first release 2️⃣ Build: short sprints where I work as your Full Stack Developer and React Developer and ship the Node.js backend and the React.js frontend feature by feature 3️⃣ Launch and support: as your Node.js Developer I handle AWS deployment, monitoring and the next round of improvements 📌 Selected work as a Full Stack Developer 🏭 Custom ERP for a global premium stroller brand: as a Full Stack Developer on a team of 9, I helped ship 17 modules over 40 weeks on Node.js and React.js. Results: 60% fewer manual operations, 40% faster shipment planning, 50% faster approvals and 90% fewer manual stock reconciliation tasks. 📦 B2B partner portal for an international product brand: 50 modules shipped in 5 sprints on Next.js and React.js with a Node.js and NestJS backend, PostgreSQL, 1C/ERP sync and delivery integrations. Built to cut repetitive manager requests by 60% and order processing time by 50%. 🧠 AI SaaS for a Swiss company: as a Full Stack Developer I helped turn a 30-parameter AI efficiency model into a web platform with ROI forecasting, what-if simulations and React.js dashboards. The client reports 3x faster strategic decisions and 35% better workforce planning. 💸 Fintech company: as a Full Stack Developer and React Native developer I built new features for their investment app and integrated a new trading service through its API. 📈 Trading platform and CRM: 234 hours of fixes and new features as a Web Developer working with React.js and as a Node.js Developer on the backend. The client called us one of the best teams they had worked with. 🚀 SEO and content marketing SaaS MVP: as a Full Stack Developer I delivered the MVP in 5 months on Node.js and React.js, on time and within budget. 🔁 Returns (RMA) system for a Swedish e-commerce company: as a Node.js Developer I built the Node.js backend and a React.js admin panel in TypeScript. 🧰 Tech stackAs a Node.js Developer I build REST API services and backend Node.js systems with NestJS and Express on PostgreSQL and MongoDB, with Redis and WebSockets for real-time features. As a React Developer I build React.js and Next.js web apps and React Native apps for iOS and Android. I deploy on AWS with Docker and CI/CD. For AI I build AI agents and AI chatbots with the OpenAI API and Claude API for automation. 🤖 AI Development As an AI Developer and Full Stack Developer I add AI to real products. I build AI agents and AI chatbots with the OpenAI API and Claude API on a Node.js backend, connect them to your data and show the results in React.js dashboards. I automate workflows and keep AI features reliable with structured outputs, validation, fallbacks and cost limits per user. 🤝 Why clients hire me as their Full Stack Developer - I think like a product owner: as the founder of my own SaaS, Avanga, I know what matters for launch and growth - I am a hands-on Node.js Developer and React Developer, not only a manager - One person is accountable for the React.js frontend and the Node.js backend, so nothing falls between teams 👉 Looking for a Full Stack Developer, a Node.js Developer or a React Developer with AI experience? Send me a few lines about your idea or current product, and I will reply with a free roadmap and a rough estimate.