Full-Stack Developer | React, Node.js & AI/LLM SaaS Applications | Web Application | AI Integration | Laravel | MVP Developer ❇️ TOP-RATED Freelancer on Upwork. ❇️ 8+ Years of Full Stack Developer Experience ❇️ Terrific Job History with 12500+ Upwork Hours ❇️ 70+ Completed Projects on Upwork 👋 Hi, I’m Mohit Kumar Nigam, a Top-Rated Full-Stack Developer with 8+ years of experience specializing in React.js, Node.js, PHP, Laravel, WordPress, React Native, and AI/LLM-powered SaaS applications. 🤖 1. AI/LLM SaaS INTELLIGENT, WORKFLOW DESIGN & AUTOMATION I specialize in AI workflow design and full-scale business automation to optimize operational bottlenecks. -LLM & AI Integration: OpenAI / ChatGPT API, Claude API (Anthropic), and custom prompt engineering. -Workflow Automation: Advanced automation setup using n8n and Zapier linked via secure custom Webhooks. -Data & CRM Integrations: Seamless synchronization with Airtable, Hubspot, Salesforce, and custom CRM architectures. -Intelligent Agents: Custom autonomous AI agents, LangChain frameworks, and automated RAG pipelines -SaaS Architecture: Multi-tenant systems, custom admin 💡 Frontend Development -Build modern, responsive, and high-performance interfaces using React.js, Next.js, Vue.js, and Angular -Convert Figma/XD designs into pixel-perfect, production-ready applications -Develop dashboards, admin panels, SaaS frontends, and client portals -Use Tailwind CSS, Bootstrap, and Material UI for clean and scalable UI ⚙️ Backend Development -Develop robust and scalable backend systems using Node.js (Express.js, NestJS) and Laravel (PHP) -Build RESTful APIs, GraphQL APIs, and microservices architecture -Implement secure authentication systems (JWT, OAuth, role-based access) -Integrate third-party services like Stripe, SendGrid, AWS S3, Redis, and CRMs 🧩 SaaS & Custom Platforms -Build multi-tenant SaaS applications from scratch -Develop subscription systems, dashboards, and admin panels -Integrate payment gateways (Stripe), CRMs, and third-party APIs -Optimize performance, scalability, and security 🧩 CMS & eCommerce -Expert in WordPress, WooCommerce, and Shopify (custom themes, Liquid templates, REST APIs). -Build multi-tenant CMS systems, subscription-based models, and donation workflows. -Create custom plugins, checkout systems, and marketplace apps. ☁️ Cloud, DevOps & Integrations -Deploy on AWS, Vercel, DigitalOcean, GCP -Work with MySQL, PostgreSQL, MongoDB, Redis -Integrate Stripe, SendGrid, Twilio, CRMs, third-party APIs -Set up Docker, CI/CD pipelines, GitHub Actions 🏆 Why Hire Me ✅ Top-Rated Full-Stack Developer with 100% client satisfaction ✅ Expert in SaaS platforms and scalable multi-tenant architecture ✅ Strong communication and long-term collaboration mindset ✅ Full-time availability (40+ hrs/week) with on-time delivery ✅ Post-launch support and continuous improvement 🧠 Tech Stack Highlights -AI, LLM & Automation: OpenAI, ChatGPT, Claude, LangChain, Zapier, Make (Integromat) -Frontend Development: React.js, Next.js, Vue.js, Angular, Tailwind CSS, Bootstrap -Backend Development: Laravel (PHP), Node.js, NestJS, Express.js, Python (FastAPI/Flask) -Databases & Storage: PostgreSQL, MySQL, MongoDB, Redis -CMS & eCommerce: WordPress, WooCommerce, Shopify, Headless CMS -Cloud & Deployment: AWS (S3, CloudFront, Lambda), Vercel, Google Cloud Platform (GCP) -DevOps & Scalability: Docker, Kubernetes, GitHub Actions, CI/CD Pipelines ✨ Let’s Build Your SaaS or AI Product Looking for a reliable Full-Stack Developer for your SaaS, AI, or web application project? Let’s connect and turn your idea into a scalable, high-performing product. 📩 Send me a message to discuss your project — from idea to launch KEYWORDS Full Stack Developer | Frontend Developer | Front-End Developer | Backend Developer | Back-End Developer | React.js Developer | Vue.js Developer | Next.js Developer | Node.js Developer | TypeScript Developer | JavaScript Developer | JavaScript Expert | React Native Developer | Flutter Developer | PHP Developer | Python Developer | Django Developer | Mobile App Developer | SaaS Developer | ERP Developer | Web App Developer | UI/UX Design | CRM Developer | Tailwind CSS | Bootstrap | API Integration | REST API | GraphQL Developer | Web App Development | Figma to HTML | WordPress Developer | Elementor Expert | WooCommerce | Shopify Developer | Custom Shopify App | Shopify Liquid | ACF | Payment Gateway Integration | Booking Website | ChatGPT Integration | OpenAI API | AI Chatbot Developer | WhatsApp Bot | AI Dashboard | LangChain | Claude Integration | AI Automation | Zapier Automation | Workflow Automation | Flutter App Developer | Ionic App | Hybrid App Development | Mobile App with API | Cross-Platform App | Android/iOS Developer | Firebase Integration | Laravel Developer | FastAPI Developer | Supabase | MySQL | PostgreSQL | MongoDB Developer | Docker | CI/CD Pipeline | GitHub Actions | AWS Deployment | GCP Deployment | Cursor | Lovable | Claude

✅ 4000+ hours on Upwork ✅ 100% Client Satisfaction ✅ Top Rated Plus Professional I'm here to be your reliable partner, someone who comprehends the complexities of your business and delivers accordingly. Whether you're evolving your idea into a remarkable product, facing challenges with scaling up, or in need of marketing and business automation, I've got your back. I'm a seasoned Full Stack Senior Engineer with 7 years of industry experience, and I'm excited to bring my expertise to the Upwork platform. With a strong background in both mobile and web development. Solving complex problems and delivering innovative solutions tailored to your unique requirements is my forte. But wait! I'm not just about professional endeavors. I have personally crafted a comprehensive curriculum that introduces children to the exciting world of programming. Service types: ✅ Strategic Planning and Consultancy: Optimize your project outcomes by leveraging my strategic planning and consultancy services. If you have specific goals, detailed project specifications, and a limited budget, I can help you define your product concept and deliver solutions within your desired timeframe and budget. ✅Software Innovation Services: Elevate your software product with cutting-edge features and impactful app creation. From enhancing capabilities and staying ahead of the competition through new features development to crafting user-friendly and high-performance apps, I guide you through the entire process. Transform ideas into reality and make a lasting impression in the dynamic world of software development. ✅Software Maintenance and Support: Enhance the performance of your software product and foster customer loyalty with my assistance. I provide comprehensive software maintenance and support services to ensure your product functions optimally. By addressing issues promptly and offering reliable assistance, I help you improve customer satisfaction and retention. ✅ Major skills: - Frontend development (HTML, CSS, JS/TS, React.js, Vue.js) - Backend development (Node.js, Python, Firebase, MySql, MongoDb) - Mobile Development (React Native, Flutter) Whether you're a client looking for top-notch development services or a fellow freelancer seeking collaboration, I'm here to deliver exceptional results. Let's connect and discuss how we can bring your vision to life!

Full-Stack Developer specializing in React, Next.js, Node.js, and SaaS Web Applications. I build scalable dashboards, APIs, admin panels, AI-powered tools, and high-performance web apps for startups and growing businesses. I focus on clean architecture, performance, security, and long-term reliability — not quick fixes. My experience includes SaaS platforms, data-driven apps, admin dashboards, and mobile-friendly web applications. Tech Stack Frontend: React, Next.js, JavaScript, Vue, HTML/CSS, Tailwind, Bootstrap Backend: Node.js, Express.js, Nest.js, Django, GraphQL, PHP Databases: MongoDB, MySQL, PostgreSQL, Firebase, DynamoDB Mobile: React Native, Flutter Tools & Cloud: GitHub, AWS, GCP, Azure, Jira I deliver high-quality engineering at a fair price. Since I work from a Tier-3 city, I provide strong technical value with lower operational overhead, while maintaining premium-level standards. If you’re looking for a reliable developer for long-term collaboration, I’d be happy to connect and help build your next solution.

As a Senior Full-Stack and AI Engineer with 14+ years of experience, I specialize in designing and building scalable web applications, cloud platforms, AI-powered automation systems, and high-performance APIs. I have extensive experience developing enterprise SaaS platforms, CRM/ERP systems, fintech applications, and AI-driven automation solutions using modern technologies such as Python, Node.js, Golang, Java, .NET, Ruby on Rails, React.js, and Next.js. I also work extensively with AI and automation frameworks, building intelligent workflows and LLM-powered applications using tools like LangChain, LangGraph, HuggingFace models, and n8n automation pipelines. Core Technical Expertise AI & Automation LLM integrations (OpenAI, Claude, HuggingFace) LangChain & LangGraph AI workflows Automation pipelines using n8n AI-powered SaaS platforms and content automation systems AI chatbots and intelligent agents Backend Development Python (FastAPI, Flask, Django) Node.js (REST APIs & microservices) Golang microservices Java (Spring Boot) .NET / ASP.NET Core Ruby on Rails Frontend Development React.js and Next.js TypeScript and modern JavaScript frameworks Angular Responsive UI development using Tailwind and Bootstrap Mobile Development React Native cross-platform mobile applications Blockchain Development Solidity smart contracts Ethereum and Web3.js integrations NFT and decentralized applications Cloud & DevOps AWS, Azure, and Google Cloud Docker, CI/CD pipelines Scalable microservices architecture Why Clients Hire Me ✔ 14+ years of professional development experience ✔ Expertise across AI, cloud, full-stack, and blockchain technologies ✔ Proven track record building enterprise SaaS platforms and scalable systems ✔ Strong focus on clean architecture, performance, and maintainable code ✔ Clear communication and reliable project delivery If you are looking for a senior engineer who can build scalable applications, AI-powered solutions, or modern SaaS platforms, I would be happy to discuss your project. Let's connect and bring your idea to life. Thanks, Hitesh Kanwar

Hi! 🖐 Looking for a skilled MERN stack developer for your web development project? Look no further! The DevIT team is here to take all your tasks and deliver a perfect result! 💪 Our experienced developers are proficient in React.js, Node.js, MongoDB, and Express.js. We've built websites with dashboards of different kinds, web apps, and websites with OpenAI integration - there are no impossible tasks! With a focus on high-quality code, user-friendly interfaces, and responsive designs, our developers are committed to delivering projects that exceed expectations. We’ve had the chance to work with clients from across the world, and we guarantee meeting timelines and maintaining communication, irrespective of time zones. The majority of our clients return to us with new projects, and this is the best recommendation 💯 Whatever task you have, you can be sure - we will deliver a perfect solution! Contact us today to learn how we can help bring your web development project to life! Our main skills, including but not limited to: ✅ Front-end: Redux, Redux-thunk, Axios, Axios Retry, js-queue, Lodash.js, Redux-Form, Reselect, Angular 2+, TypeScript, jQuery, Bootstrap, SASS/LESS, CSS3, HTML5, Webpack. ✅ Back-end: Node.js ✅ JavaScript: React.js, Node.js, Next.js, Vue.js, Angular.js, React Native ✅ Server-side: Amazon AWS, Microsoft Azure, Google App Engine, Nginx, Docker ✅ Databases: MongoDB, PostgreSQL, MySQL, Redis, Oracle DB, HBase, Microsoft SQL Server, Sybase. ✅ DevOps: Docker, Kubernetes, Ansible, Bash, AWS (Lambda, DynamoDB, API Gateway, S3, etc.), GitLab ✅ API - Google, Facebook, Stripe, PayPal, Different lead API, Twilio API, Cognito, AWS, REST.API, GraphQL, etc. ✅ Payment Gateways - PayPal, Google Checkout, Stripe, Adyen, Sofort, Custom payment gateways, etc. Last updated 1st July 2026 Keywords: MERN Stack, React.js, Node.js, Express.js, MongoDB, Next.js, Redux/Zustand/Context API, RESTful APIs, GraphQL, JavaScript (ES6+), TypeScript, Full Stack Web Development, API Integration, Microservices Architecture, Server-Side Rendering (SSR), Single Page Applications (SPA), Component-Based Architecture, WebSocket/Real-Time Apps, Authentication & Authorization (JWT, OAuth), MVC Architecture, Responsive Design, Tailwind CSS/Material UI/Bootstrap, UI/UX Optimization, Performance Optimization, Lighthouse/Core Web Vitals, Cross-Browser Compatibility, Git/GitHub/GitLab, Docker, AWS/DigitalOcean/Vercel, CI/CD, Agile/Scrum, Jira/Trello/ClickUp, SaaS Platform Development, Dashboard/Admin Panel, E-commerce Platform, Marketplace Development, CRM/ERP System, Healthcare/Fintech Apps, Real-time Chat Application, Social Network App, Booking/Scheduling Platform

Businesses today need more than just a website. They need fast, scalable, and intelligent applications that help automate work, improve user experience, and support business growth. I’m 𝗦𝗮𝗻𝗱𝗲𝗲𝗽, a 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗠𝗘𝗥𝗡 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with 6+ years of experience building modern web applications, SaaS platforms, and AI-powered tools using 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀, 𝗡𝗲𝘅𝘁.𝗷𝘀, 𝗡𝗼𝗱𝗲.𝗷𝘀, and modern JavaScript technologies. I help startups and growing businesses turn ideas into high-quality web platforms that are fast, scalable, and easy to use. Along with full-stack development, I also integrate 𝗔𝗜 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀 into web applications such as AI chatbots, AI assistants, smart search, content generation tools, and workflow automation. These features help businesses save time and create smarter digital experiences. My focus is always on 𝗖𝗟𝗘𝗔𝗡 𝗖𝗢𝗗𝗘, 𝗦𝗖𝗔𝗟𝗔𝗕𝗟𝗘 𝗔𝗥𝗖𝗛𝗜𝗧𝗘𝗖𝗧𝗨𝗥𝗘, and 𝗟𝗢𝗡𝗚-𝗧𝗘𝗥𝗠 𝗣𝗥𝗢𝗗𝗨𝗖𝗧 𝗚𝗥𝗢𝗪𝗧𝗛. 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗕𝘂𝗶𝗹𝗱 • Full-stack MERN web applications • SaaS platforms and startup products • AI-powered web applications • AI chatbots and AI assistants • REST APIs and backend systems • Custom dashboards and admin panels • Third-party API integrations • Automation tools and smart workflows • High-performance modern user interfaces 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝘆 𝗦𝘁𝗮𝗰𝗸 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 React.js, Next.js, Redux, JavaScript, TypeScript, HTML, CSS 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 Node.js, Express.js, REST APIs 𝗔𝗜 & 𝗦𝗺𝗮𝗿𝘁 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀 AI integrations, AI chatbots, AI assistants, automation tools, intelligent web features 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀 MongoDB, MySQL, PostgreSQL 𝗠𝗼𝗯𝗶𝗹𝗲 React Native, Flutter 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 AWS, Vercel, Docker, Git 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲 • 6+ years of development experience • Clean and scalable code • Reliable communication and delivery • Experience building SaaS and startup products • Focus on performance and scalability If you're looking to build 𝗔𝗜-𝗣𝗢𝗪𝗘𝗥𝗘𝗗 𝗔𝗣𝗣𝗟𝗜𝗖𝗔𝗧𝗜𝗢𝗡𝗦, 𝗠𝗢𝗗𝗘𝗥𝗡 𝗦𝗔𝗔𝗦 𝗣𝗟𝗔𝗧𝗙𝗢𝗥𝗠𝗦, or 𝗦𝗖𝗔𝗟𝗔𝗕𝗟𝗘 𝗙𝗨𝗟𝗟-𝗦𝗧𝗔𝗖𝗞 𝗪𝗘𝗕 𝗦𝗢𝗟𝗨𝗧𝗜𝗢𝗡𝗦, feel free to reach out. 𝗟𝗘𝗧’𝗦 𝗧𝗨𝗥𝗡 𝗬𝗢𝗨𝗥 𝗜𝗗𝗘𝗔 𝗜𝗡𝗧𝗢 𝗔 𝗣𝗢𝗪𝗘𝗥𝗙𝗨𝗟 𝗗𝗜𝗚𝗜𝗧𝗔𝗟 𝗣𝗥𝗢𝗗𝗨𝗖𝗧

🟢 Available for ongoing hourly work I help teams build, maintain and modernize React, Next.js and Node.js applications - especially SaaS products, CMS-driven platforms, dashboards and business-critical web apps. I work best with existing products where the team needs a reliable full-stack developer who can understand the codebase, investigate issues, fix bugs, improve performance, connect frontend with backend systems and keep shipping without unnecessary hand-holding. What I can help with: → React / Next.js development, bug fixing and refactoring → Node.js APIs, integrations and backend logic → SaaS dashboards, admin panels and business-critical web apps → Payload CMS, Statamic and headless CMS setup or cleanup → Website speed, Lighthouse and Core Web Vitals optimization → Forms, lead tracking, CRM / Google Sheets integrations and automation → Angular legacy upgrades when needed → Technical audits with a clear roadmap before implementation Why clients work with me: • 10+ years of full-stack development experience • $100K+ earned on Upwork • 100% Job Success • Top Rated Plus - top 3% of talent on Upwork • Strong experience with long-term projects, legacy systems and existing codebases • I work async, communicate clearly and can take tasks from investigation to implementation • Comfortable working with US, UK, EU and CEE clients Recent work: ▪ Upgraded a large legacy Angular application to a modern version ▪ Built a real estate platform with Payload CMS + Next.js and custom editorial workflows ▪ Built Next.js + Statamic CMS websites for business and healthcare clients ▪ Improved website performance, forms, tracking and lead flow for existing websites ▪ Built and launched React Native apps for iOS and Android A good first step is usually a small technical audit, fixed-scope rescue sprint or first implementation milestone. I can identify the highest-impact issues, explain what is worth fixing first, and then continue with implementation or ongoing hourly support.

Full-Stack Developer with 9+ years building scalable SaaS platforms, FinTech dashboards, and HealthTech apps using React.js, Next.js, Node.js, and Ruby on Rails. 𝗪𝗵𝗮𝘁 𝗜 𝗕𝘂𝗶𝗹𝗱 𝗙𝗼𝗿 𝗬𝗼𝘂- React.js & Next.js web apps · Ruby on Rails backends · Node.js / Nest.js APIs · SaaS platform development · MVP development · FinTech dashboards · HealthTech applications · E-commerce solutions · REST & GraphQL API integrations 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 ▪ 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: React.js, Next.js, TypeScript, Vue.js, Tailwind CSS ▪ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Node.js, Nest.js, Ruby on Rails ▪ 𝗔𝗣𝗜𝘀 & 𝗣𝗮𝘆𝗺𝗲𝗻𝘁𝘀: REST, GraphQL, Stripe, PayPal, Twilio, Plaid, Firebase ▪ 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗕: AWS, PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch 𝗣𝗿𝗼𝘃𝗲𝗻 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 ▪ Scaled a HealthTech SaaS platform from 0 to 50K+ users with zero downtime ▪ Cut FinTech dashboard load time from 6s → 1.3s, improving user retention ▪ Delivered full-stack migrations for enterprise clients without service interruption ▪ Shipped 10+ production MVPs across EdTech, E-commerce, and Enterprise domains 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 Discovery call (free, 30 min) → Scope & cost estimate → Agile delivery with sprint-based tracking → Weekly video progress updates → Automated QA + manual testing → CI/CD deployment + ongoing support Ready to build something that scales? Let's talk send a message and I'll respond within a few hours. 𝗪𝗵𝗮𝘁 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 𝗙𝗼𝗿 Full-Stack Web Development, React.js Development, Next.js Development, Node.js Development, Ruby on Rails Development, SaaS Platform Development, MVP Development, Web Application Development, API Development & Integration, REST API Development, GraphQL API Development, FinTech Dashboard Development, HealthTech Application Development, E-commerce Development, Enterprise Web Applications, Frontend Development, Backend Development, TypeScript Development, Database Architecture, Cloud Deployment & DevOps

Senior Full-Stack Developer | 𝟳+ 𝘆𝗲𝗮𝗿𝘀 𝗶𝗻𝘁𝗼 𝗝𝗮𝘃𝗮𝘀𝗰𝗿𝗶𝗽𝘁 / 𝗟𝗮𝗿𝗮𝘃𝗲𝗹 | Can assist with your projects 35+ hours a week. I am a senior software engineer and a Full stack developer with a passion to work in Javascript and its frameworks and a firm grip over leading server-side and client-side languages, libraries, and frameworks as mentioned below: JavaScript Frameworks & Libraries: ❇️ JavaScript (ES6+, ESNext) | TypeScript ❇️ React.js, Redux, Next.js, Vue.js (Nuxt.js), Angular, Reusable Components ❇️ Material UI, Chakra UI, Ant Design, Semantic UI React, React Bootstrap I am a Javascript expert with excellent communication for both video and audio calls, I would love to connect with You to find out more about how I can help :) Looking for your reply!

Senior MERN Stack Developer | Expert FullStack PHP Developer | Expert Laravel Developer | React.js Developer | Node.js Developer| AWS | MongoDB | FireBase | Express.js | Typescript | Mysql | CI/CD Pipeline | Web Development | Web Application With 6+ years of hands on experience, I help businesses turn ideas into fully functional, scalable and high performing web applications using MERN stack (i.e. MongoDB, Express.js, React.js, Node.js) alongside Next.js, Tailwind CSS and Bootstrap for modern UI and optimized performance. I specialize in building feature rich web apps that are responsive, secure and easy to maintain. Services I Offer: Full Stack Web Development (React.js, Node.js, MongoDB, MySQL) Custom Web Applications & E-commerce Solutions API Development & Integration Realtime Web Apps (Chat, Dashboards, Collaboration Tools) Database Design & Optimization (MongoDB, MySQL) Tech Stack Expertise: Frontend: React.js, Next.js, Redux Toolkit, Tailwind CSS, Bootstrap Backend: Node.js, Express.js, Laravel Database: MongoDB, MySQL Tools: Git, Postman, Stripe, JWT, Webhooks Hosting: Vercel, Netlify, Heroku, AWS (Basics) Why Work With Me? Clean, scalable code and modular architecture. Fast, responsive, mobile first web experiences. Clear communication and full project ownership. Business focused mindset aka I care about your goals! So let’s work together to bring your product to life, whether it's a dashboard, SaaS app or an entire platform.