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🚀 Senior MERN Stack Developer with 12+ years of experience helping startups build SaaS platforms and MVP applications. 🏅 Full Stack MERN Developer | MERN Stack Developer | Full Stack Developer 🏅 MERN Stack Expert | React Js, Next Js, Node Js, TypeScript, MongoDB | Tailwind 🥇 100+ high-impact projects successfully delivered| 🏆 Consistent 5-star feedback from client 📢 About Me I’m Sergio, a Full Stack MERN Developer with 12+ years of experience building scalable, high-performance web applications from scratch. I’ve delivered 150+ full stack applications across SaaS, eCommerce, fintech, healthcare, and enterprise platforms. I take ownership of the entire development processfrom planning and architecture to deployment and optimization. I specialize in: 👉React & Next.js for fast, responsive, SEO-friendly frontends 👉Node.js & Express for secure, high-performance APIs 👉MongoDB & PostgreSQL for scalable, well-structured databases Clients work with me because I focus on what actually matters: 👉Clean, maintainable code 👉Performance and scalability from day one 👉Clear communication and dependable delivery 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 𝐈 𝐃𝐞𝐥𝐢𝐯𝐞𝐫 ✅ Full Stack MERN Development: MongoDB, Express.js, React.js, Node.js ✅ Next.js Applications: SSR, SSG, ISR, App Router, SEO & Core Web Vitals ✅ React.js Frontend Development: TypeScript, Tailwind CSS, Material UI ✅ Node.js & Express.js Backend: REST APIs, GraphQL, scalable architecture ✅ SaaS Platforms: multi-tenant architecture, RBAC, subscription billing ✅ Admin Dashboards & CRM/ERP Systems: real-time data, analytics, reporting ✅ AI Integration: OpenAI API, ChatGPT integration, AI-powered web apps ✅ eCommerce Development: Stripe, PayPal, Razorpay, cart & checkout flows ✅ Real-Time Apps: WebSockets, Socket, Firebase Realtime DB ✅ Cloud & DevOps: AWS, Docker, Vercel, CI/CD pipelines ✅ Authentication: JWT, OAuth2, NextAuth, Firebase Auth, RBAC 💡 Why Clients Choose Me as Full Stack MERN Developer ✔ Top Rated with 100% Job Success Score, a verified Upwork badge ✔ 12+ years of real Full Stack MERN experience across 150+ delivered applications ✔ Full Stack ownership, I handle React.js frontend, Node.js backend, and deployment ✔ Performance-first, SSR, ISR, code splitting, caching built in from day one ✔ AI-ready development, I add OpenAI & ChatGPT integrations that work in production ✔ Clear communication, realistic timelines, on-time delivery ✔ I think like a product owner, not just a Full Stack MERN developer 🎯 𝐂𝐨𝐫𝐞 𝐬𝐤𝐢𝐥𝐥𝐬 𝐚𝐧𝐝 𝐭𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐈 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡: • Frontend: React.js | Next.js | TypeScript | Tailwind CSS | Material UI | Redux Toolkit | Zustand • Backend: Node.js | Express.js | NestJS | REST APIs | GraphQL • Databases: MongoDB | PostgreSQL | MySQL | Firebase | Supabase • State Management: Redux, Zustand, RTK Query • AI & LLM: OpenAI API | ChatGPT Integration | AI-Powered Features • UI & Styling: Tailwind CSS, modern responsive design • Performance Optimization: Responsive design, client-side performance optimization • SEO Optimization: Technical and on-page • Cross-browser / Cross-platform: Compatibility testing • Tooling: Webpack, Vite, Git, NPM, PNPM, Docker, CI/CD (GitHub Actions, GitLab CI) •Integrations: Twilio | SendGrid | Socket | WebSockets • Cloud Platforms: AWS, Azure, Firebase Hosting, Vercel, Netlify, DigitalOcean, Heroku 🏆 What I Have Built for Clients ✔ Full Stack MERN SaaS platforms with multi-tenant architecture & Stripe billing ✔ React.js & Next.js admin dashboards with role-based access & real-time analytics ✔ AI-powered web apps with OpenAI API & ChatGPT integration ✔ Healthcare platforms with booking systems, patient portals & admin panels ✔ Next.js eCommerce storefronts with Stripe Connect & automated billing flows ✔ SEO-optimized Next.js websites | 40%+ organic traffic increase post-launch ✔ REST APIs integrated with React.js frontends & mobile clients ✔ Legacy codebase refactors | 50%+ improvement in load times & performance 📩 Ready to Build Your Full Stack MERN Application? If you need a Top Rated Full Stack MERN Developer who delivers clean, fast, and production-ready React.js & Next.js applications, send me a message today. 🚀 I respond within a few hours. Let's build something great together 🔍 Full Stack MERN Keywords & Skills Full Stack Developer | Full Stack MERN Developer | MERN Stack Developer | MERN Developer | React.js Developer | React Developer | Next.js Developer | Node.js Developer | Node Developer | Express.js Developer | MongoDB Developer | TypeScript Developer | JavaScript Developer | Full Stack Web Developer | Full Stack React Developer | Full Stack Node Developer | MERN Stack | MERN | React Next Developer | Next.js SSR | Next.js SSG | Next.js ISR | Next.js App Router | SaaS Developer | SaaS Application Developer | SaaS Platform Developer | Admin Dashboard Developer | CRM Developer | ERP Developer | AI Integration Developer | OpenAI Developer | ChatGPT Integration

I build fast, custom Next.js websites — and I add the AI features that make them do real work. From high-performance marketing sites and e-commerce to chatbots and smart assistants, I turn a Figma design or a rough idea into a polished product that looks professional and gets found on Google. What I bring: Modern stack — Next.js, React, TypeScript, Tailwind CSS. Plus Sanity CMS so you can edit your own content, and Supabase / Stripe / PayPal when you need accounts or e-commerce. AI-powered features — I integrate AI natively with the Vercel AI SDK and Claude/OpenAI. I've already shipped AI that auto-generates bilingual, correctly-localized image content for a live platform, and I build support chatbots and document Q&A (RAG) — real product features, not bolted-on widgets. Built to be found — GA4 and Google Search Console on every project, with SEO and Core Web Vitals handled from the start, not as an afterthought. One recent site I built ranks #1 on Google for its main local search term. Design-conscious — I work alongside a professional designer, so you get agency-level quality without the agency price. I keep you updated at every stage and I don't disappear after launch. Tell me about your project and I'll reply with how I'd approach it — clear scope, honest timeline, no jargon.

12+ years building production-grade web, mobile, and AI-powered applications with 100% Job Success Score and Top Rated status on Upwork. I specialize in three areas where most full-stack developers fall short: → AI & Automation: OpenAI API integrations, GPT-powered tools, trading bots, workflow automation (n8n, Zapier). Built TradersGPT, a live AI-driven trading intelligence platform. → Full-Stack Web & Mobile: React, Next.js, Node.js, Laravel on the web; Flutter & React Native for iOS/Android. From SaaS dashboards to social platforms to marketplace apps. → DevOps & Cloud: AWS, Docker, CI/CD pipelines, PostgreSQL/MongoDB. I deploy, secure, and scale what I build, no handoff to another developer needed. Recent projects: • TradersGPT - AI trading platform with OpenAI integration • TraderVerse - Full-stack trading ecosystem • TraderGuilds - Social networking platform for traders • Caribo - Flutter vehicle rental app, live on App Store & Play Store • Active SOS - Emergency alert app with real-time GPS & push notifications Tech stack: Web: React.js, Next.js, Vue.js, Node.js, NestJS, Laravel, PHP Mobile: Flutter, React Native, Swift, Kotlin AI: OpenAI API, LangChain, GPT-4, automation workflows Cloud/DevOps: AWS, Docker, CI/CD, PostgreSQL, MongoDB, Redis Payments: Stripe, PayPal, RevenueCat, in-app purchases I don't just write code, I help you choose the right architecture, avoid costly mistakes, and ship on time. Available now. Let's discuss your project.

Over the past several years, I’ve had the opportunity to design and develop high-quality, performance-driven websites and web applications. Programming has been a genuine passion for me from the start, and I continuously focus on writing cleaner, more efficient code and improving with every project. My core expertise lies in Headless and decoupled architectures. I have over 7 years of hands-on experience working with Headless CMS platforms such as Prismic, Builderio, BigCommerce, Sanity, Strapi, and Headless WordPress, along with consuming and integrating REST APIs to build scalable, flexible frontends. Technical Experience: Frontend: HTML5, JADE, HAML, CSS3, SASS/SCSS, LESS, Bootstrap, Reactjs, Vuejs, Nuxtjs Content Management Systems: Headless CMS (Prismic, Sanity, Strapi, Builderio, Headless WordPress), WordPress, Webflow, Joomla, Squarespace eCommerce Platforms: Magento, WooCommerce, Shopify, BigCommerce, and custom eCommerce solutions Payment Gateways: AuthorizeNet, Stripe, Amazon Payments REST APIs: Google, Twitter, Instagram, Google Maps, Facebook, LinkedIn, LogMyCalls I focus strongly on user experience and performance, ensuring websites are fully responsive, fast, secure, and free of issues across all screen sizes and devices. All code is written with clean architecture and SEO best practices in mind to support long-term growth and visibility. I’m comfortable working independently or as part of a team, and I value clear communication, transparency, and attention to detail. I also believe in continuous learning and applying modern best practices to make digital products more intuitive and effective. P.S. I provide regular updates throughout the project to ensure complete visibility and alignment. Let’s connect and discuss how I can help you build a reliable, high-performing web platform.

𝐘𝐨𝐮𝐫 𝐈𝐝𝐞𝐚 𝐈𝐬𝐧'𝐭 𝐉𝐮𝐬𝐭 𝐂𝐨𝐝𝐞. 𝐈𝐭'𝐬 𝐚 𝐅𝐮𝐭𝐮𝐫𝐞. 𝐋𝐞𝐭'𝐬 𝐁𝐮𝐢𝐥𝐝 𝐈𝐭. Stop settling for applications that just exist. Stop losing users to clunky experiences. You're not in the business of basic digital presence; you're here to make a serious impact. If your web or mobile application isn't a powerful engine for engagement and efficiency, you're leaving growth on the table. 𝐇𝐨𝐰 𝐈 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐃𝐢𝐠𝐢𝐭𝐚𝐥 𝐃𝐨𝐦𝐢𝐧𝐚𝐧𝐜𝐞: ➔ Full Stack Architecture: Crafting robust MERN and React Native solutions from concept to launch, ensuring seamless functionality across web and mobile. ➔ Performance Optimization: Implementing blazing-fast load speeds and smooth experiences that keep users engaged and ready to act. ➔ Strategic UI/UX: Designing intuitive interfaces that not only look stunning but strategically guide users to achieve your business goals. ➔ Scalable Solutions: Building applications ready for 100 or 100,000+ users, designed for growth and future demands. ➔ User Engagement Focus: Transforming every interaction into a positive experience that drives conversions and loyalty. 𝐖𝐡𝐲 𝐓𝐨𝐩 𝐁𝐫𝐚𝐧𝐝𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: ✔️ Top-Seller & 100% JSS: Consistently delivering exceptional results validated by client satisfaction. ✔️ 20+ Projects Delivered: Proven track record across diverse web and mobile applications globally. ✔️ 5+ Years Expertise: Deep command over MERN, React Native, and full-stack ecosystems. ✔️ Outcome-Driven: Focused on driving real user engagement and measurable business growth. Are We a Good Fit? ✅ You need an application that drives serious engagement and efficiency. ✅ Your leadership demands tangible growth from your digital presence. ✅ You're ready to invest in a robust solution that scales with your ambition. ✅ You value strategic partnership over just lines of code. Let's Build the Future of Your Business. Click "Message" now. Full Stack Developer, Web Application Development, Mobile App Development, MERN Stack, React Native Developer, React.js, Node.js, Express.js, MongoDB, JavaScript, Frontend Development, Backend Development, UI/UX Design, Next.js, TypeScript, REST APIs, Responsive Design, Performance Optimization, Agile Development, Cross-Browser ,Nest Js, Compatibility, Redux, Git, Figma, Web Accessibility, Component-Based Architecture, Single Page Applications, State Management, Code Splitting, Lazy Loading, SEO Optimization, Testing, CI/CD, Version Control, Code Review, Scrum, Kanban, Wireframing, Prototyping, User Testing, API Integration, JSON, AJAX,

🎯 I help clients turn their Figma designs into responsive HTML / React / Next JS websites with accuracy and quality. 👉 Front-end Developer - Figma & React / Next. 🏅 Top-Rated - 100% Client Success. 🏆 5+ years experience. 👋 Feel free to watch my 50 second design video, for a glimpse of my work! ❓ What do my previous clients say? - “Always prepared to go the extra mile and level up the website!...” - “Awesome quality of work. Did everything as expected, and then some.” ❓ What can you expect working with me? - Regular Communication - Progress Updates as they Happen - On-Time Delivery - Support Before and After the Project - Quality Design - Led By Research & Experience - Proper Code - Using Industry Standard Practices - Updates & Revisions - Changes Made with Your Feedback - SEO Friendly Build - A Website Search Engines Will Love - Cross-Compatible - It’ll Work on Mobiles, Computers, TV’s & More ❓ Is your technology in this list? 👇 These are all tools I’ve worked with; - Figma - Next JS - React JS - Tailwind CSS - Material UI (MUI) - SCSS / CSS - Wordpress - Three JS (for 3D Experiences) ❓ What makes me unique from the crowd? - I Invest In My Skills - 3D Experiences Are My Newest Skillset - Handcrafted Results - I Design & Code From Scratch - Honesty & Integrity - I Value Clear Communication - Passion - This Is What I Call Fun! If you've got questions, please don't hesitate to contact me. ⚡ I can't wait to help you, deliver a successful and exciting result. 🔑 Keywords (These help show my profile, to the most relevant clients I can help); frontend developer, next.js, react.js, figma to html, figma designer, figma to wordpress, react developer frontend react, react next js, next js developer, next js wordpress, ui ux web design, ui ux designer figma