Hans R.

Full Stack Developer | MERN| React.js | Node.js | Next.js | AI & SaaS

With over 12 years of experience in full-stack web development, I help startups, SaaS companies, and growing businesses build fast, scalable, and production-ready applications using the MERN stack and modern JavaScript technologies. I specialize in developing secure, high-performance web applications, SaaS platforms, dashboards, internal business tools, marketplaces, CRM and ERP systems, and AI-powered applications. Whether you need an MVP for your startup or want to scale an existing product, I can take ownership of the entire development lifecycle—from architecture and backend APIs to responsive frontend interfaces and cloud deployment. 💻 My Core Expertise ✅ React Development ✅ Next Development ✅ Node Development ✅ Express ✅ MongoDB & PostgreSQL ✅ REST APIs & GraphQL ✅ TypeScript & JavaScript ✅ Tailwind CSS & Material UI ✅ Authentication (JWT, OAuth, Firebase, Auth0) ✅ AI & LLM Integration ✅ AI Agents & Vector Databases ✅ Payment Gateway Integration (Stripe, PayPal) ✅ AWS, Vercel & DigitalOcean ✅ Docker & CI/CD 🚀 I Can Help You Build 💼 SaaS Applications 🤖 AI-Powered Web Applications 📊 CRM & ERP Systems 📈 Admin Dashboards 🛒 Marketplace Platforms 📅 Booking & Scheduling Systems 🏠 Real Estate Platforms 🏥 Healthcare Applications 💳 FinTech Applications 🎓 Educational Platforms 👥 Customer Portals ⚙️ Internal Business Tools 🔗 API Development & Third-Party Integrations ⭐ Why Clients Work With Me ✔️ 12+ years of professional development experience ✔️ Expert in the MERN stack and scalable system architecture ✔️ Clean, maintainable, and well-documented code ✔️ Mobile-first, responsive UI development ✔️ Performance optimization ✔️ Reliable communication and on-time delivery ✔️ Experience working with startups, agencies, and enterprise businesses ✔️ Ability to lead projects from planning to deployment 🛠️ Technologies 🎨 Frontend React • Next • Redux Toolkit • TypeScript • JavaScript • HTML5 • CSS3 • Tailwind CSS • Material UI • Bootstrap ⚙️ Backend Node • Express • NestJS • REST APIs • GraphQL • Socket IO 🗄️ Database MongoDB • PostgreSQL • MySQL • Firebase • Supabase ☁️ Cloud & DevOps AWS • Vercel • Docker • GitHub Actions • CI/CD • DigitalOcean 🤖 AI & Automation GPT • LLMs • LangChain • AI Agents • RAG • Pinecone • Vector Databases • n8n Automation 🌍 Industries I've Worked With 🏥 Healthcare • 🎓 Education • 🏨 Hospitality • 🏠 Real Estate • 🛒 E-commerce • 💰 Finance • 🏭 Manufacturing • 🚚 Logistics • 📢 Marketing • 👨‍💼 Recruitment • ✈️ Travel • 🎉 Events • 🍽️ Restaurants 🤝 Let's Build Something Great Together If you're looking for a developer who understands both technology and business goals, I'd be happy to help turn your idea into a reliable, scalable, and high-performing product.