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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

Full-stack engineer with 10+ years of experience building production software for startups and SMBs. I work across two directions: 1. AI-powered products — I build apps and platforms with AI at the core. From mobile apps to web platforms, I take AI product ideas from concept to launch and handle the full lifecycle: architecture, development, deployment, and iteration. 2. Intelligent automation for businesses — I automate company operations using AI. I map your existing processes — sales, onboarding, finance, communications, content creation — and build systems that run them with minimal manual intervention. AI agents, workflow engines, CRM integrations, and multi-channel routing. In both cases, I own the full stack: backend, frontend, mobile, integrations, and deployment. What I build with: - AI systems using Claude, GPT, and Gemini APIs (tool-use, streaming, vision, memory) - Mobile apps with React Native / Expo (iOS + Android) - Web apps with Next.js, React, Node.js - Automation workflows with n8n - Integrations with Stripe, WhatsApp Business, Google Workspace, Pipedrive, HubSpot and more Background: Former Product Manager at Baidu. I've built and launched over 50 products, so I understand the full lifecycle — not just the code. I think in terms of business outcomes. Tech: React, Next.js, React Native/Expo, Node.js, MongoDB, Supabase, Claude API, Gemini API, OpenAI API, n8n, Stripe, AWS S3

Cloud & Security Architect | M365, Azure, Hybrid Identity, Infrastructure Hardening I design and secure modern cloud and hybrid infrastructure for growing businesses and distributed teams. My work focuses on identity, access control, endpoint management, network design, and operational resilience across Microsoft 365, Azure, AWS and mixed Windows/Linux environments. With more than a decade of hands-on systems engineering experience, I have delivered migrations, identity redesigns, Intune deployments, SD-WAN transitions, secure baseline builds and disaster recovery improvements across enterprise and SMB environments. Security is not an afterthought in my work. I implement hardened configurations, MFA and Conditional Access policies, secure device enrollment, backup validation and infrastructure monitoring as part of every engagement. I also conduct infrastructure reviews and security posture assessments to identify misconfigurations, exposed services and operational risks before they become incidents. My approach is structured and outcome-driven: • Clear scope and execution plan • Secure-by-default architecture • Practical remediation guidance • Clean documentation and handover If you need help with Microsoft 365, hybrid identity, endpoint compliance, infrastructure hardening or cloud security improvements, I can help.

I'm a highly experienced Fullstack developer with a focus on client outcomes. Your satisfaction is my core objective. Over the last 16 years I've worked with PHP, Node.JS, MySQL/PostgreSQL/MSSQL, React/Vue.JS/Svelte/Angular/jQuery and related web technologies to create a large number of websites and web applications. I have a real passion for all things software/hardware. I also have excellent Ubuntu/Debian/CentOS Linux administration skills and have managed a large number of different servers. If you're after a serious and capable programmer then look no further.

I'm an Australian eCommerce and website developer with over 10 years of fullstack development experience. I've worked on everything from embedded systems to websites and like to take on challenging projects. I graduated from the University of Sydney with a Bachelor of Computer Science where I learned the fundamentals of my craft. After graduating I worked at Google then Canva as well as several startups where I learned industry best practices in software development before beginning my career as a freelancer. I am a Shopify partner and have completed projects with WordPress, Jekyll, Wix, Weebly and Squarespace using frameworks including node.js, jQuery, Anguler, Vue, Apollo and React. Web technology is my passion so I take pride in my knowledge of CSS, HTML, Javascript, SVG, WebRTC and DNS. I love to take on challenging and interesting projects and I'm looking to form long term relationships with clients by getting things done on time and within budget.

I build high-performance Flutter & React Native mobile apps that scale, convert, and delight users. 150+ apps delivered | 5+ years experience | iOS & Android apps built with clean, scalable architecture. Hi! I’m Hamza, a Senior Mobile App Developer specializing in 𝗙𝗹𝘂𝘁𝘁𝗲𝗿 𝗮𝗻𝗱 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲. I build modern, fast, and user-friendly mobile applications for businesses worldwide. Over the last 5+ years, I’ve delivered 150+ high-quality mobile apps to clients across the globe. Many of my apps now serve thousands of daily users, helping businesses improve operations, increase sales, and launch products faster than competitors. I’m a software engineer with a degree in Software Engineering, and I focus on clean code, scalable architecture, and high performance. 𝗪𝗵𝗮𝘁 𝗜 𝗕𝘂𝗶𝗹𝗱 I develop full mobile apps using Flutter and React Native, including: • Full mobile applications (Flutter / React Native) • E-commerce apps • On-demand apps • Social & chat apps • CRM, dashboard & business apps • AI-powered mobile applications • Health, finance, and productivity apps 𝗠𝘆 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 ✅ 𝗙𝗹𝘂𝘁𝘁𝗲𝗿 • Cross-platform UI • Custom widgets • State management • API integration • Firebase integration ✅ 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 • Native-like performance • Navigation & animations • REST APIs & backend connectivity • Redux / Context API • Third-party libraries 𝗪𝗵𝗮𝘁 𝗜 𝗢𝗳𝗳𝗲𝗿 I specialize in cross-platform mobile app development and deliver polished iOS and Android apps with high performance. 🌟 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗦𝗸𝗶𝗹𝗹𝘀: • Flutter — build high-performance cross-platform apps • React Native — smooth native-like apps • Dart — clean and efficient Flutter code • JavaScript/TypeScript — scalable mobile apps • UI/UX Design — pixel-perfect interfaces • Firebase — real-time database & analytics ⚙️ 𝗕𝗮𝗰𝗸-𝗘𝗻𝗱 𝗦𝗸𝗶𝗹𝗹𝘀: • Node.js — fast and scalable backends • Python — complex app logic & automation • PHP/Laravel — secure backend development • MySQL/MongoDB/PostgreSQL — efficient data management 🤖 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: • OpenAI, ChatGPT, Claude, Gemini, LLaMA • AI chatbots, personalization, automation 📂 𝗩𝗲𝗿𝘀𝗶𝗼𝗻 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: • Git & GitHub — organized and trackable development 𝗠𝘆 𝗧𝗿𝗮𝗰𝗸 𝗥𝗲𝗰𝗼𝗿𝗱 I’ve delivered 150+ mobile app projects, from e-commerce apps delivered in 18 days (when others quoted 3 months) to custom CRMs and healthcare solutions. Every project is delivered with precision, clean code, and full client satisfaction. 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 • Understand your needs clearly and plan a simple approach • Work fast while keeping you updated • Deliver reliable, user-friendly apps on time 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲 • Fast responses • Easy communication • Always learning • Detail-oriented and reliable 𝗔𝗰𝘁𝗶𝗼𝗻𝘀 𝘀𝗽𝗲𝗮𝗸 𝗹𝗼𝘂𝗱𝗲𝗿 𝘁𝗵𝗮𝗻 𝘄𝗼𝗿𝗱𝘀. Drop me a message, and let’s discuss your project. I’m ready to build your app fast, efficiently, and with high quality. Keywords: Flutter, Flutter Developer, Flutter App Development, Flutter Mobile App, React Native, React Native Developer, React Native App Development, Cross-Platform Development, Mobile App Developer, iOS App Development, Android App Development, Dart Developer, JavaScript Developer, TypeScript Developer, UI/UX Design, Firebase Integration, API Integration, Mobile App UI, Custom App Development, Mobile App Architecture, Node.js Backend, REST API, State Management, Redux, Provider, Bloc, App Performance Optimization, Mobile App Testing, App Deployment, App Store Submission, Google Play Deployment, Mobile App Consulting, MVP Development, Backend Integration, Full-Stack Mobile Development, Mobile App Prototyping, Responsive App Design, App Scaling, Real-Time Apps, Business Apps Development, On-Demand App Development, E-commerce App Development, Social App Development, CRM App Development, Real-Time Apps (Socket / Firebase), Mobile App Architecture, Mobile App Prototyping, App Scaling & Maintenance.