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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

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.

𝗜𝗳 𝗜 𝗲𝘃𝗲𝗿 𝘀𝗲𝘁 𝘁𝗵𝗲 𝘄𝗿𝗼𝗻𝗴 𝗲𝘅𝗽𝗲𝗰𝘁𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗰𝗮𝗻’𝘁 𝗱𝗲𝗹𝗶𝘃𝗲𝗿, 𝗜 𝗼𝗳𝗳𝗲𝗿 𝗮 𝗳𝘂𝗹𝗹 𝗿𝗲𝗳𝘂𝗻𝗱, 𝗻𝗼 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀 𝗮𝘀𝗸𝗲𝗱. ▪️Senior Full Stack Developer (10+ years) focused on SaaS and MVP builds ▪️Modern TypeScript stack: Next.js, NestJS, PostgreSQL, Redis ▪️I build from idea to production, with clean architecture, your team can maintain ▪️Often brought in by founders for MVP launches, rebuilds ▪️I work like a product partner, clear trade-offs, no BS As a Senior Full Stack Developer, I’m usually brought in for MVP builds, product rebuilds, and this is breaking in production moments. That’s the difference between hiring a Senior Full Stack Developer and hiring someone who only ships features. 𝗛𝗲𝗿𝗲’𝘀 𝘄𝗵𝗮𝘁 𝗜 𝗱𝗼: 𝟭. 𝙁𝙪𝙡𝙡-𝙎𝙩𝙖𝙘𝙠 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🔹 I take your idea and turn it into a production-ready MVP or SaaS product, end to end 🔹 You get clean code, fast delivery, and documentation your team can actually use 𝟮. 𝗙𝗿𝗼𝗻𝘁-𝗘𝗻𝗱 (𝗥𝗲𝗮𝗰𝘁, 𝗡𝗲𝘅𝘁.𝗷𝘀 𝟭𝟱, 𝗧𝗮𝗶𝗹𝘄𝗶𝗻𝗱𝗖𝗦𝗦) 🔹 Dashboards and product UIs that feel fast and don’t fall apart as you grow 🔹 SSR and performance work to keep load times down and UX smooth 𝟯. 𝗕𝗮𝗰𝗸-𝗘𝗻𝗱 (𝗡𝗲𝘀𝘁𝗝𝗦, 𝗡𝗼𝗱𝗲.𝗷𝘀) 🔹 APIs, auth, permissions, and business logic built for real-world usage 🔹 Background jobs, queues, and webhooks that stay stable when requirements change 𝟰. 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 (𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟, 𝗣𝗿𝗶𝘀𝗺𝗮, 𝗗𝗿𝗶𝘇𝘇𝗹𝗲, 𝗥𝗲𝗱𝗶𝘀) 🔹 Database design, migrations, and query tuning for production performance 🔹 A clean data layer with Prisma or Drizzle, and Redis caching when it’s worth it 𝟱. 𝗖𝗹𝗼𝘂𝗱 (𝗔𝗪𝗦, 𝗩𝗲𝗿𝗰𝗲𝗹) 🔹 Reliable deployments with clean environments and predictable releases 🔹 AWS when you need real control, Vercel/Railway/Render when you need speed and iteration 𝟲. 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 🔹 I turn founder specs into a clear technical plan your team can execute 🔹 I make the trade-offs early so you don’t pay for them later with rewrites 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗜 𝗵𝗮𝗻𝗱𝗹𝗲 𝟭. SaaS product development (A to Z ownership) 𝟮. MVP builds with Next.js and TypeScript under real production constraints 𝟯. Backend systems with NestJS (auth, APIs, business logic) 𝟰. PostgreSQL and Redis performance fixes and data modeling 𝟱. Background jobs, queues, and async workflows 𝟲. AWS deployments and production stabilization 𝟳. Debugging slow, breaking, or unreliable systems 𝟴. Codebase cleanup: refactors, structure, release safety 𝟵. Technical consultation before you build the wrong thing in your SaaS 𝗧𝗼𝗼𝗹𝘀 𝗜 𝘂𝘀𝗲 - Next.js, React, TypeScript, Tailwind CSS - Node.js, NestJS - PostgreSQL, Redis - Prisma ORM, Drizzle ORM - AWS (Certified), Vercel, Supabase, Neon - Git, production-grade workflows When we work together, I will make sure your MVP is built the right way: clean code, strong architecture, and a solid foundation your team can maintain. 𝙄𝙛 𝙮𝙤𝙪 𝙬𝙖𝙣𝙩 𝙖 𝙎𝙚𝙣𝙞𝙤𝙧 𝙁𝙪𝙡𝙡 𝙎𝙩𝙖𝙘𝙠 𝘿𝙚𝙫𝙚𝙡𝙤𝙥𝙚𝙧 𝙬𝙝𝙤 𝙘𝙖𝙣 𝙤𝙬𝙣 𝙮𝙤𝙪𝙧 𝙎𝙖𝙖𝙎 𝙗𝙪𝙞𝙡𝙙 𝙤𝙧 𝙈𝙑𝙋, 𝙧𝙚𝙖𝙘𝙝 𝙤𝙪𝙩. 𝙏𝙝𝙚 𝙗𝙚𝙨𝙩 𝙬𝙖𝙮 𝙩𝙤 𝙨𝙩𝙖𝙧𝙩 𝙞𝙨 𝙬𝙞𝙩𝙝 𝙖 𝙘𝙝𝙖𝙩. 𝗧𝗮𝗴𝘀: Full Stack Developer, SaaS Developer, SaaS MVP Development, Web Application Developer, MVP Developer, Backend Developer, API Development, Node.js Developer, NestJS Developer, React Developer, Next.js Developer, PostgreSQL, Redis, Database Design, Cloud Deployment, AWS Developer, Software Architecture, Startup SaaS, Product Development, Production Systems

Immediate joiner My name is Hardik, and I am an experienced and skilled Full Stack (Angular + Nodejs) Developer. With over 6 years of experience in the industry, I have developed a strong set of skills and a passion for delivering top-quality work to my clients. I am dedicated to meeting the needs and exceeding the expectations of every client I work with, and I take pride in delivering exceptional results on every project. If you're looking for a reliable and skilled freelancer to help bring your ideas to life, I would be honored to work with you. Thank you for considering me as your freelancing partner. ✅ Angular, Typescript, Javascript, HTML, CSS/SCSS, Bootstrap, Material, Vue, Ionic & Electron. ✅ Karma-Jasmine (E2E & Unit Testing), NGRX, RXJS. ✅ Nodejs, REST API, Express, Swagger & Postman. ✅ ORM, MSSQL, MySQL, PostgreSQL, MongoDB, Firebase. ✅ Authentication (O-Auth, Google, JWT, Facebook, Twitter, Other Social Media...). ✅ Github, Gitlab, Bitbucket, Jira. ✅ Azure DevOps & Custom Server setup. ✅ MVC Architecture, Design Patterns, Data Structure & Algorithm, Agile & Lean methodologies. ✅ Third-party API integration. ✅ Leadership, Management, Strong communication, Adaptive, Collaborative & Problem-solving.

Hi, I am Aakash a Mobile Application Developer with 5+ years of experience building fast, clean, and scalable apps for both iOS and Android. I specialize in crafting cross-platform apps with smooth UI/UX, real-time features, and secure backend integrations. From idea to App Store/Play Store deployment, I handle the entire app lifecycle. I have worked on apps in various domains including self-growth, real-time chat, e-commerce, finance, and productivity tools always focused on delivering high-quality, user-friendly solutions. I have delivered apps that include custom dashboards, prompt libraries, note history, payment systems, and more. My goal is always to help bring meaningful, functional, and polished mobile solutions to life. Let’s build something impactful together.

I help startups and businesses build AI-powered web applications, SaaS products, and custom tools using Next.js, React, Node.js, OpenAI, and Supabase. 🚀 AI Full-Stack Developer specializing in SaaS applications, AI integrations, and modern web development. I help startups and businesses build AI-powered web applications, SaaS products, and custom tools using Next.js, React, Node.js, OpenAI, and Supabase. My expertise includes: ✅ Full-Stack Development ✅ Next.js & React ✅ Node.js & Express ✅ TypeScript & JavaScript ✅ OpenAI API Integration ✅ AI Chatbots & AI Features ✅ Supabase & PostgreSQL ✅ REST APIs & Third-Party Integrations ✅ Authentication & User Management ✅ Tailwind CSS & Responsive UI ✅ Stripe Payment Integration ✅ SaaS MVP Development I can help with: • AI-powered applications • Startup MVP development • SaaS dashboards • API integrations • Admin panels • Document processing systems • Chatbots and AI assistants • Custom web applications Tech Stack: Next.js • React • Node.js • TypeScript • Supabase • PostgreSQL • MongoDB • OpenAI • Tailwind CSS • Vercel I value clear communication, clean code, and delivering solutions that are scalable and maintainable. Let's build something great together. thanks, Amandeep Sahni Keywords : AI Full-Stack Developer Full-Stack Development Next.js Developer React Developer Node.js Developer SaaS Development Startup MVP AI Chatbot Development OpenAI API API Integration Supabase PostgreSQL TypeScript Web Application Development Custom Software Development