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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

Most businesses don't have a CRM problem. They have a business process problem hiding inside their CRM. A company buys HubSpot expecting better sales visibility, automation, and follow-up. Then six months later, leads are still being manually managed, sales pipelines don't reflect reality, follow-ups are forgotten, data is scattered across different tools, and the founder is still asking: "What's actually happening with our leads?" That's where I come in. I'm Menno Tabbernal, a business owner, CRM specialist, business growth mentor, and systems strategist. I run multiple businesses both online and offline, and work with founders through business audits, growth strategy, process improvement, automation, delegation, and operational efficiency. So when I work on a CRM, I don't start with the software. I start with the business. 🔹 How does a lead enter the business? 🔹 What happens next? 🔹 Who owns each stage? 🔹 Where is information getting lost? 🔹 What is the team doing manually? 🔹 What should actually be automated? Then we build the system around those answers. 🚀 HUBSPOT CRM & AUTOMATION I help businesses turn HubSpot into a structured sales and business system that actually supports growth. • HubSpot CRM setup & architecture • Sales pipeline & lifecycle design • HubSpot workflows & automation • Lead routing, nurturing & follow-up • Task & activity automation • Apollo + HubSpot integration • Zapier, Make, API & third-party integrations • CRM data cleanup & migration • Dashboards & reporting • CRM audits, optimization & troubleshooting • Team training & handover ⚙️ BITRIX24 & CRM SYSTEMS My CRM expertise also includes: • Bitrix24 implementation & architecture • Sales pipelines & workflow automation • Automation rules • Smart Processes / custom CRM structures • Multi-company CRM environments • Pipedrive & other CRM systems • Sales and operational process design 🔍 SOMETIMES THE CRM ISN'T THE REAL PROBLEM A founder may say: "We need more automation." But after looking at the business, the real problem may be an unclear sales process, poor lead qualification, duplicated work, disconnected tools, weak delegation, or a founder who has become the bottleneck. That's why I also conduct Business Growth & Systems Audits. I identify: • Operational bottlenecks • Inefficient workflows • Sales process weaknesses • Automation opportunities • Delegation gaps • Founder-dependent processes • Communication breakdowns • Technology being used inefficiently My rule is simple: Don't automate a broken process. Fix the process, then automate it. 🛠️ HOW I WORK 1. Discover — Understand your business and current process. 2. Audit — Find gaps, bottlenecks and opportunities. 3. Architect — Design the CRM, workflows, data structure and integrations. 4. Implement — Build the system. 5. Automate — Remove repetitive manual work. 6. Test & Optimize — Validate everything against real scenarios. 7. Train — Make sure you understand and can manage the system. I don't believe in building complicated systems that only the consultant understands. The goal is a CRM your business can actually use. 🎯 WHO I WORK BEST WITH Agencies • Recruiting & Executive Search • Real Estate • Professional Services • Coaches • Consultants • Service Businesses • Growing Teams Especially businesses thinking: "We can't keep running everything manually anymore." If your HubSpot is messy, your CRM is underused, your sales process needs structure, your tools aren't communicating, or your business has simply outgrown its current systems, let's talk. Tell me what's happening in your business. We'll start with the problem and work backwards to the right solution. Menno Tabbernal HubSpot Expert | HubSpot CRM | HubSpot Automation | HubSpot Workflow | HubSpot Specialist | HubSpot Consultant | HubSpot Integration

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.