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🚀 Senior Full Stack Developer | React · Next.js · Node.js · TypeScript · SaaS & AI Apps · CRM Hi, I'm Vatsal — a Full Stack Developer who helps startups and founders turn ideas into fast, scalable, production-ready web applications. I specialize in SaaS platforms and AI-powered apps, owning the full stack from frontend to backend, database, and deployment. What I build: -SaaS Platforms — multi-tenant architecture, subscription billing, role-based access, admin dashboards -AI-Powered Apps — OpenAI integrations, chatbots, intelligent automation -Full Stack Web Apps — React/Next.js frontends with Node.js, Express & NestJS backends -APIs & Integrations — REST, GraphQL, third-party services, payment gateways -Performance & Scaling — optimizing slow apps, refactoring, fixing what's broken Tech Stack: -Frontend → React, Next.js, TypeScript, Tailwind CSS -Backend → Node.js, Express.js, NestJS, REST & GraphQL -Database → PostgreSQL, MongoDB, Supabase -Cloud → AWS, Vercel, Docker -AI → OpenAI API, automation workflows Why founders choose me: ✔ Full ownership — frontend, backend, database, deployment ✔ Clean, scalable, maintainable code ✔ Clear communication & on-time delivery ✔ Long-term support after launch I treat your product like a business, not a ticket. Whether you're launching an MVP, scaling an existing app, or fixing something broken, I'll take it from first line of code to deployment. 📩 Send me a message or invite me — I respond quickly. ✅ Keywords: Full Stack Developer | Senior Full Stack Developer | SaaS Platform Developer | MERN Stack Developer | React.js Development | Next.js Development | Node.js Backend Development | TypeScript Applications | API Integration Specialist | Supabase Developer | PostgreSQL Developer | MongoDB Developer | JavaScript Expert | Dashboard & Admin Panel | Marketplace Developer | Internal Tools | Booking Systems | eCommerce Solutions | Performance Optimization | Ongoing Product Support

Generative AI, LLM & RAG Solutions | AI Agents | Production-Ready AI SaaS Applications | Enterprise AI Architectures | React, Next.js, Node.js & Laravel | Cloud-Native AI Products ❇️ TOP-RATED Freelancer on Upwork ❇️ 9+ Years of Senior Full-Stack Engineering Experience ❇️ 70+ Successfully Delivered Enterprise & SaaS Projects ❇️ Elite Track Record with 12,500+ Logged Hours 👋 Hi, I’m Mohit Kumar Nigam. I help startups and businesses build production-ready AI systems, scalable SaaS platforms, and robust web applications. With 9+ years of experience and 70+ delivered products, I specialize in combining Full-Stack Engineering + Artificial Intelligence to launch secure, maintainable, and highly optimized software built for real production environments. 🤖 1. AI SaaS, LLM & RAG Engineering I build practical, high-performance AI systems powered by modern Large Language Models, frameworks, vector architectures • LLM Development: OpenAI (GPT-4o/o3-mini), Claude, Gemini, DeepSeek-R1, Prompt Engineering, LLM Integration. • AI Agents: LangChain, LlamaIndex, CrewAI, vLLM, Multi-Agent Systems, AI Copilots, Workflow Automation. • RAG & Vector DBs: RAG, Semantic Search, Embeddings, Pinecone, PGVector, Vector Search. • Multimodal AI: Vision AI, Whisper, OCR, Document AI, Image Understanding. • AI SaaS & Full-Stack: React, Next.js, Node.js, Laravel, REST APIs, Cloud-Native AI Applications. 💻 2. Full-Stack & System Architecture I deliver clean-code architectures utilizing modern frontend frameworks and backend systems. • Frontend: High-performance interfaces using React.js, Next.js, TypeScript, and Tailwind CSS. • Backend & APIs: Secure architectures built on Node.js (NestJS/Express), Laravel (PHP), and Python (FastAPI). • Databases & Caching: Robust data layers via PostgreSQL, MySQL, MongoDB, and Redis caching. • SaaS Utilities: Multi-tenant infrastructure, Stripe billing, and secure OAuth 2.0/JWT authentication. 📱 3. Cross-Platform Mobile Apps • Frameworks: Production-ready mobile engineering using Flutter (Dart) and React Native (TypeScript). • Ecosystems: Firebase integration, local data syncing, and automated App Store / Play Store deployment ☁️ 4. Cloud, DevOps & System Architecture AWS, GCP, Azure & DigitalOcean | Docker & Kubernetes | GitHub Actions & GitLab CI/CD | OAuth 2.0, JWT, MFA & RBAC | REST, GraphQL & WebSockets | Stripe & Multi-tier Monetization 🏭 Industries I Serve • AI & Automation Startups | FinTech, Banking & InsurTech | Healthcare, MedTech & HealthTech • E-commerce, Marketplaces & Retail | EdTech & E-Learning Platforms | Logistics, Supply Chain & Fleet Management • Real Estate & PropTech | Hospitality, Travel & Booking | MarTech & Marketing Automation • Enterprise ERP/CRM Systems | LegalTech & Document Automation | Cybersecurity & Identity Management ✨ LET'S BUILD YOUR PRODUCT Ready to launch your SaaS platform, build an MVP, or integrate cutting-edge AI features? Let’s connect to map out a bulletproof technical strategy. 📩 Click the "Message" button on the right to start your project today. 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 | 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

I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online portal and web app, I can help. 🌟 Top-rated Development Provider ( Technology Stack ). Web Development: - Angular, HTML, CSS, React JS, Vue JS, Jade, Next JS, Drupal, Liferay, CMS Portal, JBPM, Pega Backend Development: - Java, Node JS, Spring Boot, PHP, Magento, Laravel, Drupal, WordPress, Hibernate, .NET, Microservices, API, Python, Netflix Zuul, KAFKA Messaging System Database Management: - MongoDB, MySQL, SQL, Oracle, Postgres, NoSQL, Hadoop, Graph DB, Neo4J Mobile Development: - React Native, Android Java, Kotlin, iOS Swift, Objective C, Flutter, Responsive Angular DevOps and Cloud Services: - AWS, GCP, Azure, Digital Ocean, FreeCerts, SSH, Cloudflare, Domain.com Design and User Experience: - Figma, Adobe XD, Photoshop, Visual Communication, Web Design, Usability Testing, User Interface Design, Mobile App Design, User Experience Design, iPhone UI Design Content Writing: - Whitepapers, Blogs, Website Content, Technical Writing, Legal Agreements, Proposals ( Project Focus Areas ) Business Domains: - Healthcare, Insurance, Social Media, Messaging, Dating, Fitness, On-demand Delivery (Restaurant/Courier) Startup Support: - Idea Validation, Market Research, UI/UX Design, Development, Marketing Consultation SMEs Digitalization: - Website and Mobile App Development, Research, Management Dashboards Technological Trends: - AR, Healthcare, Flutter, TensorFlow, ReactJS, AngularJS, NodeJS Methodologies: - Agile, RESTful Web Development Amazon Web Services Expertise: - S3, EC2, CloudFront Open Source Contributions: - Plugins like youtube_model and acts_as_redeemable on GitHub API and SDK Development: - Payment Gateway Integration (Stripe, Apple Pay, PayPal) - Hardware Integration (Sonos, Profusion, Bluetooth, Roku, Chromecast, Apple TV, Bluetooth Beacon, MINIX) - Messaging and Chat API (Twilio) - Google Maps GeoLocation API - Social Media Integration (Facebook, Google, Twitter, Instagram) Always learning and growing, we're here to help you achieve your goals. Drop us a note with your requirements, and let us handle the rest.

I help startups and businesses build Casino, Sports Betting, Poker, Multiplayer, and Gaming Platforms that are secure, scalable, and revenue-focused. With 14+ years of experience, and 100% Job Success, I deliver high-performance web, mobile, and game solutions for global clients. Expertise: ✔ Casino Platforms ✔ Sportsbook / Live Betting ✔ Poker / Multiplayer Games ✔ Unity Game Development ✔ Unreal Engine Development ✔ CSGO / Steam API Projects ✔ Mystery Box / Reward Platforms ✔ Wallet / Payment Integrations ✔ Admin Panels / Backoffice Systems Tech Stack: React.js, Node.js, Next.js, Laravel, PHP, MongoDB, MySQL, PostgreSQL, AWS, Docker, Unity, Unreal Engine, React Native, Flutter Why Hire Me: ✔ Gaming industry expertise ✔ Clean scalable architecture ✔ Fast communication ✔ On-time delivery ✔ Long-term support ✔ Conversion-focused UI/UX Clients Hire Me For: ✅ MVP to Full Product Development ✅ Existing Platform Upgrades ✅ Real-Time Systems ✅ API Integrations ✅ Dedicated Long-Term Developer If you need an expert for Casino, Sports Betting, Unity, Unreal, Poker, or Gaming Platform Development, send me a message and let’s discuss your project.

I’m a skilled web developer with 6+ years of experience in website and web app development. Below are listed my area of specialisation. My area of expertise: - Node JS - Express Framework - PostgreSQL - MongoDB - Clickhouse - knex.js - Socket - Redis - AWS - AWS S3 - AWS scheduler - AWS SNS - GCP Cloud Storage - AWS SQS - 100ms Server SDK/API - Firebase Notification - Firebase Push Notification - Docker - GraphQL - Git - Microservices - Javascript - JQuery - HTML - CSS -ReactJS - Typescript - jWt I am a professional and a person with a process. I preferred to be in the latest trends of development and part of communities. Learning and researching solutions is the key thing which I follow. Please let me know your web app problem and rest assured I will try to add the solution which is suitable to it.

Are you looking for a Top Rated Full Stack Developer who can build, optimize, and scale modern web applications? With 7+ years of professional experience, I help startups, SaaS companies, entrepreneurs, and established businesses build high-performance, scalable, secure, and user-friendly web applications. From MVP development and business websites to SaaS platforms, dashboards, API-driven applications, and enterprise solutions, I provide end-to-end Full Stack Development with strong expertise across both frontend and backend technologies. My core expertise includes React.js, Next.js, Node.js, TypeScript, JavaScript, Express.js, NestJS, MERN Stack, MongoDB, PostgreSQL, AWS, REST API, GraphQL, and third-party API integrations. I focus on writing clean, reusable, scalable, and maintainable code while delivering fast, responsive, secure, and reliable applications designed for long-term business growth. What I Can Help You With * Full Stack Web Application Development * React.js Development * Next.js Development * Node.js Development * Express.js & NestJS Development * MERN Stack Development * TypeScript & JavaScript Development * SaaS Product Development * MVP Development * Custom Web Application Development * Business Web Application Development * REST API Development * GraphQL API Development * Third-Party API Integration * Payment Gateway Integration * Stripe & PayPal Integration * Dashboard & Admin Panel Development * CRM & ERP Development * Customer Portal Development * Database Design & Development * AWS Cloud Development & Deployment * Performance Optimization * Bug Fixing & Troubleshooting * Code Refactoring & Legacy Code Improvement * Existing Application Enhancement * Long-Term Maintenance & Support Why Clients Choose Me Top Rated Freelancer * 7+ years of professional Full Stack Development experience * Strong frontend and backend development expertise * Expertise in React.js, Next.js, Node.js, and MERN Stack * Scalable and secure application architecture * Clean, reusable, and maintainable code * Strong REST API and GraphQL development experience * Advanced database design and optimization * Experience with SaaS and multi-user applications * Secure authentication and role-based access control * AWS cloud development and deployment experience * Performance-focused development approach * Clear and transparent communication * Agile development methodology * Reliable delivery and long-term technical support Technical Skills Frontend Development: React.js, Next.js, TypeScript, JavaScript, Redux, Tailwind CSS, Material UI, HTML5, CSS3, Responsive Web Design Backend Development: Node.js, Express.js, NestJS, REST API, GraphQL, WebSocket, Microservices Database Development: MongoDB, PostgreSQL, MySQL, Firebase, Database Design, Query Optimization Cloud & DevOps: AWS, EC2, S3, Lambda, Cognito, CloudFront, Docker, Git, GitHub, CI/CD, Vercel API & Third-Party Integrations: REST APIs, GraphQL, Stripe, PayPal, Twilio, Firebase, Google APIs, Payment APIs, External API Integrations Security & Architecture: JWT, OAuth, Authentication, Authorization, RBAC, API Security, SaaS Architecture, Multi-Tenant Architecture, Scalable Backend Architecture Applications & Products I Can Build: I can help you develop a new application from scratch or improve an existing product, including: * SaaS Platforms * AI-Powered Web Applications * CRM & ERP Systems * Business Management Applications * E-commerce Platforms * Customer Portals * Admin Dashboards * Analytics Dashboards * Real-Time Applications * Marketplace Platforms * Subscription-Based Applications * API-Driven Applications * Enterprise Web Applications * Internal Business Tools * Custom Web Applications Existing Application? I Can Help Improve It. If you already have an existing web application, I can work directly with your current codebase instead of recommending an unnecessary rebuild. My approach is simple: understand the existing system, identify the real bottlenecks, improve what matters, and avoid unnecessary rewrites. Core Keywords: Full Stack Developer, Full Stack Web Developer, React.js Developer, React Developer, Next.js Developer, Node.js Developer, MERN Stack Developer, TypeScript Developer, JavaScript Developer, SaaS Developer, SaaS Development, Web Application Development, Custom Web Development, Frontend Developer, Backend Developer, REST API Development, GraphQL Development, API Integration, AWS Developer, MongoDB Developer, PostgreSQL Developer, Express.js, NestJS, Cloud Development, MVP Development, Dashboard Development, Admin Panel Development, Software Development, Application Development, Performance Optimization, Code Refactoring #ReactJS #NextJS #NodeJS #FullStackDeveloper #MERNStack #TypeScript #JavaScript #SaaSDevelopment #WebDevelopment #SoftwareDevelopment #AWS #MongoDB #PostgreSQL #RESTAPI #GraphQL #APIIntegration #FrontendDeveloper #BackendDeveloperi