Hire the Best Mercurial Developers

Need a reliable developer to build or scale your web application? I specialize in developing fast, scalable, and production-ready web applications using the MERN stack (MongoDB, Express.js, React.js, Node.js). Over the past 7+ years, I have helped startups and growing businesses turn ideas into reliable digital products — from SaaS platforms and dashboards to complex backend APIs and full-stack applications. My focus is always on writing clean, maintainable code and building systems that are easy to scale as your business grows. 🔹 What I Can Help You With • Full-Stack Web Application Development (MERN Stack) • Backend Development with Node.js & Express.js • React.js Frontend Development (modern UI, responsive design) • REST API Development & Third-Party API Integrations • SaaS Platforms, Admin Dashboards, and Custom Web Applications • Database Design & Optimization (MongoDB, PostgreSQL, MySQL) • Performance Optimization, Debugging, and Code Refactoring • Upgrading or maintaining existing applications 🔹 Core Technologies Backend: Node.js, Express.js, REST APIs, Microservices Frontend: React.js, JavaScript (ES6+), HTML5, CSS3, Bootstrap, Material UI Databases: MongoDB, PostgreSQL, MySQL Tools & DevOps: Git, Docker, CI/CD, AWS 🔹 Development Approach I follow an agile and milestone-based development process to ensure transparency and steady progress. I break complex requirements into manageable tasks so clients always have visibility into development and can provide feedback early. Clear communication, reliable delivery, and long-term client relationships are very important to me. 🔹 Industry Experience E-Commerce | SaaS Platforms | Healthcare | Fintech | Real Estate | Social Platforms If you’re looking for a dedicated developer who can build or improve your web platform with modern technologies and scalable architecture, I’d be happy to discuss your project. Let’s connect and bring your idea to life. Best regards, Komal

Integrated systems rarely break on the first successful API call. They break three weeks later: a failed Shopify webhook, an ERP order that never synced, a CRM contact missing from the pipeline, or POS inventory that no longer matches the store. I build and fix the middleware/API layer behind those systems. My strongest work is around Shopify, ERP, CRM, POS, and Laravel-based backend systems where product data, orders, inventory, customers, payments, and reporting all need to stay aligned. What I usually handle: - Shopify / Shopify Plus integrations and custom commerce workflows - ERP and CRM syncs: Acumatica, Salesforce, Zoho, HubSpot, SAP-style systems - POS and inventory workflows: Clover, store operations, loyalty, order flows - Laravel/PHP middleware, APIs, webhooks, queues, cron jobs, retries, and logs - Admin dashboards, reporting panels, and operational data models - Production debugging where the issue is hidden across multiple systems Relevant background: - Built and supported systems handling 24k+ products, 3M+ users, and 2,000+ locations - Led technical delivery across teams of 20+ - Worked across Shopify, Shopify Plus, Magento, BigCommerce, Acumatica, Salesforce, Zoho, Clover POS, Laravel, REST/GraphQL APIs, PostgreSQL, MySQL, AWS, Firebase, and payment systems I also take on SaaS MVPs and React Native app work when the project depends on backend architecture, integrations, subscriptions, analytics, or production stability. If your store, ERP, CRM, POS, or internal dashboard is held together by fragile syncs and unclear data flow, I can help trace where it breaks and make the system reliable.

If you're looking for a developer who can own your product from idea to production without rework, delays, or hand-holding, I can help. 30+ products launched across multiple industries Proven track record delivering scalable, production-ready systems —————————— About Me —————————— I’m Sajjad, a Senior Full Stack Developer focused on building high-impact digital products using React.js, Nextjs, Node.js, Serenity, JVZoo and .NET technologies. I work with startups and growing businesses to turn ideas into scalable SaaS platforms, automation systems, AI-powered applications, and modern Next.js solutions — with full ownership from planning to deployment. —————————— Core Expertise (SEO-Optimized) —————————— Full Stack Development • React.js, Next.js, Next.js App Router • Node.js, Express, Fastify • .NET Core, ASP.NET, C#, Serenity, JVZoo • MERN Stack & MEAN Stack architecture • Enterprise-grade architecture using .NET + React + Next.js SaaS & Web Applications • Multi-tenant SaaS platforms • Admin dashboards & analytics systems • Scalable product architecture • Enterprise web applications using .NET • High-performance Next.js SaaS applications Backend & APIs • REST APIs & third-party integrations • Authentication systems (JWT, OAuth, Identity in .NET) • Microservices architecture (Node.js & .NET) • Database design (PostgreSQL, MongoDB, SQL Server) • API integrations for Next.js applications Mobile Development • React Native • Flutter Cloud, DevOps & Infrastructure • AWS, Azure (including .NET hosting & services), GCP • Docker, Kubernetes, Terraform • CI/CD pipelines & automated deployments • Automated monitoring & infrastructure management • Configuration management & Git workflows • Performance optimization & scalability planning • Vercel, Next.js deployment, cloud hosting & DevOps automation CMS & Headless Systems • Contentful, Strapi, Sanity, Php • Headless CMS architecture with Next.js AI, Automation & RPA • AI-powered features using modern APIs (LLMs, automation workflows) • RPA (Robotic Process Automation) for business process optimization • Workflow automation, data pipelines, and smart integrations • Chatbots, internal tools, and AI-driven dashboards ——————————— Industry & Domain Experience ——————————— I've built solutions across multiple domains, including: • SaaS & Startups • Fintech & Crypto • Logistics & Supply Chain • TMS (Transportation Management Systems) • WMS (Warehouse Management Systems) • Education & Training • LMS (Learning Management Systems) • Health & Wellness (CME), GYM, Fitness • Food & Restaurant Platforms • Real Estate Tech • Social & Community Platforms ——————————— Modern Tools & Builder Ecosystem ——————————— I also work with next-gen product development tools to accelerate delivery and MVPs: • Base44 • Claude • Lovable • Bolt • Rocket • Supabase • Next.js + Supabase architecture • Other low-code / no-code and rapid prototyping platforms This allows faster validation, reduced costs, and quicker go-to-market when needed. ————————— How I Deliver ————————— I focus on business outcomes, not just code: • Clear, US-friendly communication • Fast execution with scalable architecture • Clean, maintainable, production-ready code • Full ownership from idea → launch → scale I can also contribute as a Technical Lead / Fractional CTO: • Architecture & system design (Node.js, Next.js , Python & .NET ecosystems) • Product roadmap planning • Team collaboration & scaling —————————— Additional Capabilities —————————— • Stripe & payment integrations • Shopify & eCommerce systems, ElevenLabs • AI integrations & automation tools • Database optimization & performance tuning • Custom dashboards & analytics platforms • Enterprise solutions using .NET stack • SEO-friendly Next.js applications with SSR & SSG —————————— Mobile-Ready Solutions —————————— • React Native (primary) • Flutter (based on use case) —————————— Let's Connect —————————— If you need a Senior Full Stack Developer (React, Next.js, JVZoo, Node.js, Python & .NET) who can: • Build scalable SaaS or automation systems • Develop high-performance Next.js applications • Implement AI-driven features • Deliver without micromanagement Let's connect. No fluff. Just execution. You're not obligated to make any payment if you're not fully satisfied with my work.

𝗧𝗼𝗽-𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 – 𝗔𝗺𝗼𝗻𝗴 𝘁𝗵𝗲 𝗧𝗼𝗽 𝟯% 𝗼𝗳 𝗨𝗽𝘄𝗼𝗿𝗸 𝗧𝗮𝗹𝗲𝗻𝘁 Full-Stack Software Developer with 14+ years of experience building scalable SaaS/MVP platforms, AI-powered applications, and enterprise web systems. I help startups and growing companies design, build, and scale modern web platforms using React, Next.js, Node.js, and cloud infrastructure. My focus is delivering production-ready systems that are fast, secure, and built to scale. I’ve worked on Upwork in-house projects and delivered solutions for Upwork Enterprise clients, building 100+ applications from MVP to large-scale platforms used by thousands of users. 𝗪𝗵𝗮𝘁 𝗜 𝗕𝘂𝗶𝗹𝗱 𝗠𝗼𝘀𝘁 𝗢𝗳𝘁𝗲𝗻 • SaaS/ERP platforms and startup MVPs • Multi-tenant SaaS architecture • AI-powered applications, AI Agents & LLM integrations • Scalable backend APIs and microservices • API-first platforms & third-party integrations • High-performance React / Next.js frontends • CRM systems and business dashboards • Cloud-native and serverless applications 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: Frontend : React.js, Next.js, Angular.js, TypeScript, JavaScript (ES6+), Tailwind CSS, Material UI, Redux, Zustand, Responsive UI, React Native Backend : Node.js, Express.js, NestJS, .NET Core, ASP.NET MVC, Python APIs, REST APIs, GraphQL, Authentication, Webhooks, Payment Integrations AI & Automation : OpenAI APIs, LLM Integrations, AI Workflows, AI SaaS Platforms, Cloude, ChatGPT, Cursor, Antigravity Cloud & DevOps : AWS (Lambda, EC2, S3), Azure, Docker, CI/CD Pipelines, Cloud Architecture, Performance Optimization, Vercel Databases : PostgreSQL, MongoDB, MySQL, Supabase, FireBase 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 • SaaS Platforms & AI Products • FinTech & Business Automation Systems • Healthcare/Real Estate ERP Systems • E-commerce Platforms & Marketplaces • Enterprise & Manufacturing Software If you're building a SaaS product, scaling an existing platform, or integrating AI into your application, I'd be happy to discuss your project. 𝗟𝗲𝘁’𝘀 𝗰𝗼𝗻𝗻𝗲𝗰𝘁 𝘁𝗼 𝗱𝗶𝘀𝗰𝘂𝘀𝘀 𝗵𝗼𝘄 𝘄𝗲 𝗰𝗮𝗻 𝗯𝘂𝗶𝗹𝗱 𝗼𝗿 𝘀𝗰𝗮𝗹𝗲 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗱𝘂𝗰𝘁 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁𝗹𝘆. Clients Know Me As 😉 Full Stack Developer, React.js Developer, Next.js Developer, Node.js Developer, MERN Stack Developer, .NET developer, SaaS Developer, CRM Developer, AI Developer, OpenAI Developer, ChatGPT Developer, AI Automation Expert, TypeScript Developer, PostgreSQL Developer, AWS Developer, Enterprise Software Engineer, Expert-Vetted, Top Rated Plus, $500K+ Earned on Upwork, Angular

Hello, I'm Muhammad Mawan, a Full Stack Developer and founder of microBIT, with extensive experience building modern web applications, SaaS platforms, FinTech solutions, e-learning systems, AI-powered applications, and enterprise software. I help startups, businesses, and organizations transform ideas into scalable digital products by handling both frontend and backend development, cloud infrastructure, database architecture, API integrations, and deployment. My primary technology stack includes: React.js Next.js TypeScript JavaScript Node.js PHP Laravel React Native Python Firebase Supabase PostgreSQL MySQL MongoDB Prisma Tailwind CSS Bootstrap Material UI (MUI) REST APIs GraphQL Cloudinary Stripe Docker Linux Servers VPS Management Nginx Git & GitHub As a Full Stack Developer, I build responsive user interfaces, scalable backend systems, secure APIs, payment integrations, and cloud-based platforms that support real business growth. Specialized Expertise FinTech Development I have strong experience designing and developing financial platforms, payment systems, digital wallets, remittance solutions, and secure transaction processing applications. Some of my FinTech expertise includes: Payment Gateway Integration Stripe Integration Thunes Integration Digital Wallet Development Remittance Platforms KYC Workflows User Verification Systems Transaction Ledgers Financial Reporting Role-Based Access Control (RBAC) Secure Authentication Systems MFA & Security Implementation AES-256-GCM Encryption Compliance-Oriented Architecture SaaS Development I build scalable Software-as-a-Service platforms from concept to deployment. Services include: Multi-Tenant SaaS Applications Subscription Systems Admin Dashboards CRM Systems ERP Solutions Business Management Platforms Analytics Dashboards Real-Time Applications AI & Automation I also develop AI-powered applications and workflow automation systems. Skills include: OpenAI Integrations AI Chatbots AI Search Systems Natural Language Processing AI Content Generation Automation Workflows Computer Vision Solutions Image Generation Systems Recommendation Engines Web & Mobile Development I develop modern applications using: Next.js React.js React Native Progressive Web Apps (PWA) Server Side Rendering (SSR) Responsive Web Design Cross-Platform Mobile Apps SEO Optimization Performance Optimization Database Expertise I work extensively with: PostgreSQL MySQL MongoDB Firebase Firestore Firebase Realtime Database Supabase Database Design Query Optimization Data Modeling Scalable Architectures Cloud & Infrastructure I can deploy and manage applications on: VPS Servers Ubuntu Linux Docker Nginx Hostinger VPS Cloud Platforms CI/CD Pipelines Server Security Backup & Recovery Systems Industries I Have Worked With FinTech Real Estate E-Learning Payment Processing Property Management Loan Management Rental Management AI Solutions SaaS Products Business Automation Services I Offer Full Stack Web Development SaaS Development FinTech Solutions Payment Gateway Integration API Development & Integration React & Next.js Development PHP & Laravel Development Mobile App Development Database Design Cloud Deployment AI Integration System Architecture Performance Optimization Ongoing Maintenance & Support Beyond coding, I contribute to architecture planning, project analysis, development workflows, code reviews, security implementation, and technical decision-making. My goal is always to build reliable, scalable, and maintainable systems that support long-term business growth. Clients work with me because I combine strong technical expertise with practical business understanding, clear communication, and a commitment to delivering quality solutions. Whether you need a complete product built from scratch, help scaling an existing platform, FinTech development, AI integration, or ongoing technical support, I am ready to help turn your vision into reality. Best Regards, Muhammad Mawan Full Stack Developer | FinTech Developer | SaaS Architect Founder — microBIT

🚀8+ years building production-grade web apps, AI SaaS platforms, and Shopify solutions that scale from MVPs to systems serving 1M+ users. I specialize in turning complex product ideas into reliable, high-performance systems. Whether you need a Shopify store that converts, a multi-tenant SaaS platform, or an AI-powered product integration I've built it, shipped it, and optimized it under real production pressure. 📌 Recent highlights: • Built 𝗛𝗲𝗹𝗹𝗼𝗔𝘁𝗹𝗮𝘀 an AI-powered Shopify store builder with 200+ App Store reviews and a 𝟰.𝟴★ 𝗿𝗮𝘁𝗶𝗻𝗴 • Developed AI-powered products used by 𝟭𝗠+ 𝘂𝘀𝗲𝗿𝘀 across integrated platforms • Architected and scaled an AI SaaS with 𝟭𝟬,𝟬𝟬𝟬+ 𝗮𝗰𝘁𝗶𝘃𝗲 𝘂𝘀𝗲𝗿𝘀 on a multi-tenant system • Delivered 𝟰𝟬+ 𝗦𝗵𝗼𝗽𝗶𝗳𝘆 𝘀𝘁𝗼𝗿𝗲𝘀 𝗮𝗻𝗱 𝗰𝘂𝘀𝘁𝗼𝗺 𝗮𝗽𝗽𝘀 for DTC brands and Shopify Plus merchants • Improved backend/API performance by 𝟰𝟬% for a high-traffic, data-intensive production system 🛠 Core stack: Python, Django, FastAPI | React, Next.js, TypeScript | Shopify, Liquid, Hydrogen, Remix | Node.js, REST APIs, GraphQL | AWS, Docker, Kubernetes, CI/CD | PostgreSQL, Redis | OpenAI, Anthropic, LangChain | Stripe, Payment Systems 🎯 I work across: • E-commerce & Shopify (stores, custom apps, Shopify Plus, Hydrogen storefronts) • AI SaaS & LLM integrations (OpenAI, Anthropic, LangChain-powered products) • Fintech & payment infrastructure • Healthcare & wellness platforms • Multi-tenant SaaS architectures • API integrations, automation & DevOps pipelines I care deeply about clean architecture, clear communication, and shipping on time. I don't just write code I ask the right questions upfront, flag risks early, and make sure the final product actually solves your business problem. If you're building something that needs to scale, looking for a Shopify expert who understands business not just code or need AI integrated into your product the right way, let's talk. I'm ready to dig in from day one.