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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

As a 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 specializing in 𝗠𝗘𝗔𝗡 and 𝗠𝗘𝗥𝗡 stacks, I bring 𝟳+ 𝘆𝗲𝗮𝗿𝘀 of experience building 𝗦𝗮𝗮𝗦 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀, 𝗠𝗩𝗣𝘀, 𝗖𝗥𝗠/𝗘𝗥𝗣 𝘀𝘆𝘀𝘁𝗲𝗺𝘀, 𝗮𝗻𝗱 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲-𝗴𝗿𝗮𝗱𝗲 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀. My expertise covers end-to-end software development, from requirements gathering and architecture design to 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱 & 𝗯𝗮𝗰𝗸𝗲𝗻𝗱 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, API integration, cloud deployment, and DevOps automation. 𝗜 𝗮𝗺 𝗽𝗮𝘀𝘀𝗶𝗼𝗻𝗮𝘁𝗲 𝗮𝗯𝗼𝘂𝘁 transforming complex requirements into scalable, high-performance, and secure web applications that drive business growth, operational efficiency, and measurable user engagement. 𝗠𝘆 𝘄𝗼𝗿𝗸 𝗵𝗮𝘀 𝗰𝗼𝗻𝘀𝗶𝘀𝘁𝗲𝗻𝘁𝗹𝘆 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 𝟱-𝘀𝘁𝗮𝗿 𝗿𝗮𝘁𝗲𝗱 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸, 𝗵𝗲𝗹𝗽𝗶𝗻𝗴 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗹𝗮𝘂𝗻𝗰𝗵 𝗦𝗮𝗮𝗦 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀, 𝗠𝗩𝗣𝘀, 𝗮𝗻𝗱 𝗰𝘂𝘀𝘁𝗼𝗺 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀. 🛠💼 𝗖𝗼𝗿𝗲 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 & 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 ✔𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: React.js, Angular, Next.js, TypeScript, Redux, Material UI ✔𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Node.js, Express.js, RESTful APIs, GraphQL, Supabase, MySQL, PostgreSQL ✔Full Stack Development: MEAN Stack, MERN Stack, SaaS Platforms, MVP Development, Web Apps ✔𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝗦𝘆𝘀𝘁𝗲𝗺𝘀: CRM, ERP, Workflow Automation, Legacy System Migration ✔𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀: AWS, Azure, GCP, Docker, Kubernetes, CI/CD, Microservices ✔Security & Performance: OAuth, JWT, HTTPS, Secure API Integration, Scalable Architecture, Performance Optimization ✔Specialty Projects: AI-powered web apps, PDF viewer components, API-driven SaaS solutions 🥇𝗥𝗲𝗰𝗲𝗻𝘁 𝗖𝗹𝗶𝗲𝗻𝘁 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀🥇 👉Delivered multi-tenant SaaS platform supporting 120k+ users, boosting engagement by 15% 👉Built AI-powered web application integrating Supabase & YouTube API for real-time functionality 👉Completed Full Stack MVP for startups with robust, scalable architecture 👉Developed custom MERN stack components to optimize performance and user experience I follow𝗮𝗴𝗶𝗹𝗲 𝗺𝗲𝘁𝗵𝗼𝗱𝗼𝗹𝗼𝗴𝗶𝗲𝘀, 𝗰𝗹𝗲𝗮𝗿 𝗺𝗶𝗹𝗲𝘀𝘁𝗼𝗻𝗲 𝘁𝗿𝗮𝗰𝗸𝗶𝗻𝗴, 𝗮𝗻𝗱 𝗳𝗮𝘀𝘁 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 to ensure your objectives are met efficiently. Every project is approached with client-focused design, scalability, and security in mind. I can help you build, scale, or optimize your 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻, 𝗦𝗮𝗮𝗦 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺, 𝗼𝗿 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝘀𝘆𝘀𝘁𝗲𝗺 𝘄𝗶𝘁𝗵 𝗽𝗿𝗲𝗰𝗶𝘀𝗶𝗼𝗻, 𝘀𝗽𝗲𝗲𝗱, 𝗮𝗻𝗱 𝗿𝗲𝗹𝗶𝗮𝗯𝗶𝗹𝗶𝘁𝘆. 𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦: Full Stack Developer, MEAN Stack, MERN Stack, React.js, Angular, Node.js, Next.js, TypeScript, Redux, Material UI, SaaS Developer, MVP Developer, Web App Developer, Enterprise Web App, CRM Developer, ERP Developer, Frontend Developer, Backend Developer, RESTful API, GraphQL, Supabase, MySQL, PostgreSQL, AWS, Azure, GCP, Cloud Deployment, Docker, Kubernetes, CI/CD, Microservices, Performance Optimization, Secure Web App, OAuth, JWT, HTTPS, Agile Development, Milestone Tracking, Client-Focused, User Engagement, Business Efficiency, AI Web App, PDF Viewer Component, API Integration, Legacy System Migration, Workflow Automation, Scalable Architecture, High-Performance Web App, Responsive UI, Startup Web App, Modernization, SaaS Platform Launch, MVP Launch, Technical Strategy, Full Stack SaaS, Web App Optimization, Custom Software Solutions, Software Architecture, Cloud-Native Web App

I'm a Strategic CRM Consultant and Execution Specialist for ambitious businesses ready to scale. With 15+ years and 500+ successful implementations, I architect and lead complex technology transformations that unify your marketing, sales, and operations into revenue-generating systems. As a Strategic Consultant, I diagnose your technology challenges and design scalable solutions aligned to your revenue goals. As an Execution Specialist, I deliver and optimize those systems end-to-end, ensuring flawless implementation, integration, and team adoption. What I Do: As your Strategic Consultant and Execution Specialist, I combine strategic thinking with hands-on execution to transform your technology ecosystem: Strategic Consulting Audit and assess your current CRM, marketing, and sales technology landscape Identify integration gaps, automation opportunities, and revenue leaks Design integrated marketing, sales, and operations tech stacks tailored to your business model Create technical roadmaps with clear timelines, budgets, and ROI projections Recommend the right tools and platforms based on your specific business needs Implementation & Execution Lead full-scale CRM implementations managing budgets, timelines, and stakeholder alignment Build fully automated workflows in HubSpot, GoHighLevel, Keap, Zoho, and ActiveCampaign Connect disparate tools (CRMs, e-commerce, email, analytics) into cohesive ecosystems Develop custom solutions in Make, Zapier, n8n, and Retool for complex business logic Create AI-powered automations and intelligent reporting systems that drive decision-making Technology Stack Management WordPress and Wix optimization for e-commerce and lead generation Shopify + CRM integration (Klaviyo, WooCommerce, HubSpot, Keap, ActiveCampaign and custom flows) Data orchestration across Google Sheets, Airtable, Looker Studio, and Power BI AWS infrastructure, API management, and system scaling Why Work With Me: Strategic Thinking: I'm not just a technician—I'm a strategic consultant who aligns your technology investments with your revenue goals. Every tool recommendation, every automation, and every system integration serves a clear business purpose with measurable ROI. Execution Excellence: Once we've designed the strategy, I become your Execution Specialist. I manage implementation timelines, handle all technical configuration and integration work, train your team, and optimize performance. You get a deployed, adopted system—not just a plan. Enterprise-Grade Experience: I've led $500K+ implementations for startups, agencies, e-commerce brands, coaches, and healthcare providers across US, EU, and APAC regions. I'm equally comfortable with strategic discovery meetings and hands-on workflow development. Certifications & Expertise: Make and Zapier Certified Expert Advanced HubSpot, GoHighLevel, Keap certification 15+ years in marketing operations, sales enablement, and CRM consulting Proven Results: Average 40-60% reduction in manual data entry (freeing up 15-20 hours/week per team) 2-4x faster sales cycles through intelligent lead routing and nurturing 25-35% improvement in marketing attribution and ROI tracking Systems designed to scale from $1M to $50M+ annual revenue My Approach: I work in two complementary phases. First, as your Strategic Consultant, I listen deeply—understanding your revenue goals, team workflows, pain points, and current technology ecosystem. Then I architect a customized solution that's strategic, practical, and scalable. Second, as your Execution Specialist, I handle everything—technical configuration, integrations, testing, team training, and optimization. You get a fully deployed, production-ready system that your team adopts smoothly and that directly impacts your bottom line. Let's Connect: If you're ready to evolve from fragmented tools and manual processes into an intelligent, automated business system—one that's strategically designed for your needs and expertly executed for results—let's talk. I'd love to understand your current challenges and show you what's possible.

Most businesses install HubSpot CRM expecting automation, clarity, and a smoother sales process. Instead, they end up with messy pipelines, missed follow-ups, manual tasks everywhere, and reports that don’t actually reflect what’s happening in the business. I help businesses turn HubSpot into a structured sales system that captures leads, automates follow-ups, organizes pipelines, and gives clear visibility of revenue. Hi, I’m Menno Tabbernal I’m a Top Rated HubSpot CRM Expert specializing in HubSpot CRM setup, automation, workflows, and sales pipeline optimization. I help businesses transform HubSpot from a simple contact database into a fully functioning sales and operations system that supports real business growth. Most of my completed projects on Upwork have been focused on HubSpot CRM implementation and automation, though my broader CRM expertise also includes Bitrix24 and Pipedrive systems. My focus is simple: Build CRM systems that save time, eliminate manual work, and help businesses close more deals. If Your HubSpot Currently Feels Like This… • Sales pipelines that don’t reflect your real process • Leads slipping through the cracks • Manual follow-ups that should be automated • Sales teams forgetting tasks • CRM data that feels messy or unreliable • Reports that don’t show real performance Then your CRM isn’t working for you. And that’s exactly what I fix. HubSpot CRM Projects I Handle I specialize in designing clean, scalable HubSpot CRM systems tailored to how your business actually operates. Services include: • HubSpot CRM Setup & Architecture • Sales Pipeline Design & Lifecycle Stages • HubSpot Workflow Automation • Lead Nurturing & Follow-Up Automation • HubSpot Integrations (Zapier, Make, APIs, third-party tools) • CRM Data Migration & Cleanup • HubSpot Dashboard & Reporting Setup • CRM Optimization for existing HubSpot systems The goal is always the same: Create a CRM system that runs smoothly, reduces manual work, and improves sales visibility. My Approach I take a systems-thinking approach to CRM implementation. Rather than just configuring tools, I focus on designing a structure that supports how your business actually sells and operates. My process usually looks like this: 1️⃣ Discovery – Understand your business process and sales flow 2️⃣ CRM Audit – Review your existing HubSpot setup (if applicable) 3️⃣ System Design – Create a structured CRM architecture 4️⃣ Implementation – Configure pipelines, automation, integrations, and data structure 5️⃣ Testing & Refinement – Ensure everything works smoothly 6️⃣ Training & Handover – Help your team confidently use the system Business Systems & Growth Audit In addition to CRM implementation, I also work as a Business Growth Audit Specialist. Sometimes the issue isn’t just the CRM, it’s the systems behind the business. I provide focused business audits where I analyze: • Business workflows • System inefficiencies • Automation opportunities • Delegation gaps • Operational bottlenecks slowing growth Clients receive clear recommendations to streamline operations and unlock growth. This is particularly helpful for: • Agencies • Coaches • Real estate businesses • Service-based businesses • Growing teams looking to scale operations Why Clients Work With Me ✔ Top Rated freelancer on Upwork ✔ Strong expertise in HubSpot CRM architecture and automation ✔ Systems-focused approach to CRM implementation ✔ Clear communication and structured project delivery ✔ CRM experience beyond HubSpot (Bitrix24 & Pipedrive) My goal isn’t just to configure a CRM. It’s to build a system that supports your business growth. Not Sure If Your HubSpot Is Set Up Correctly? If your HubSpot feels messy, inefficient, or underused, feel free to reach out. I’m happy to review your HubSpot setup and suggest improvements that can make your CRM more effective. If you're looking for a HubSpot CRM expert who can turn your CRM into a clear, automated sales system, send me a message. Let’s build a CRM that actually works for your business. — Menno Tabbernal HubSpot CRM Expert | HubSpot Automation | CRM Systems Architect