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𝙇𝙚𝙩 𝙢𝙚 𝙩𝙚𝙡𝙡 𝙮𝙤𝙪 𝙬𝙝𝙮 𝙛𝙤𝙪𝙣𝙙𝙚𝙧𝙨 𝙖𝙣𝙙 𝙩𝙚𝙖𝙢𝙨 𝙗𝙧𝙞𝙣𝙜 𝙢𝙚 𝙞𝙣 𝙬𝙝𝙚𝙣 𝙩𝙝𝙚𝙮’𝙧𝙚 𝙗𝙪𝙞𝙡𝙙𝙞𝙣𝙜 𝙎𝙖𝙖𝙎 𝙖𝙣𝙙 𝙈𝙑𝙋𝙨. ⭐ Top Rated Plus | 2800+ hours | US & global clients 👨‍💻 Senior Full Stack Developer (10+ years) focused on SaaS and MVP builds ⭐ Comfortable working in EST time zone overlap 🔨 Modern TypeScript stack: Next.js, NestJS, PostgreSQL, Redis 🚀 I build from idea to production, with clean architecture, your team can maintain ✔ Often brought in by founders for MVP launches, rebuilds 🤝 I work like a product partner, clear trade-offs, no BS Senior React & Frontend Developer | JavaScript Developer | Typescript | Next.js | AI Integration (OpenAI, Bedrock) 💻 CORE TECHNOLOGIES: • Frontend: React, Next.js, React Native, Electron, TypeScript • Backend: Node.js, Express.js, GraphQL, RESTful APIs • Databases: MongoDB, Firebase, AWS Services • E-Commerce: Shopify Development, Custom Integrations, Payment Gateways • Cloud & DevOps: AWS (EC2, S3, Lambda, Bedrock), Firebase, Cloud Deployment • Design: Figma, Material UI, Responsive UI/UX Design 🤖 AI & ADVANCED CAPABILITIES: • AI Integration: AWS Bedrock, Machine Learning, Chatbots, Automation • Real-time Analytics: Smart dashboards, data visualization • Third-party Integrations: Payment processors, APIs, webhooks • Advanced Search: Full-text search, recommendation engines 🎯 SPECIALIZATIONS: ✓ Full Stack Web Development (MERN Stack) ✓ Shopify Store Development & Customization ✓ E-commerce Platforms (high-converting stores) ✓ Enterprise Applications & ERP/CRM Systems ✓ Real-time Features & WebSocket Implementation ✓ Mobile App Development (React Native) ✓ AI-Powered Solutions & Automation ✓ Cloud Architecture & AWS Deployments 🌟 WORK HIGHLIGHTS: • Built complex dashboards with real-time data updates • Developed AI-powered analytics platforms • Created Shopify stores generating high conversion rates • Implemented secure payment integrations • Designed scalable microservices architecture • Optimized applications for performance & SEO 🛠️ MY PROCESS: → Requirements Analysis & Technical Consultation → Architecture Design & Planning → Agile Development with Regular Updates → Testing, Optimization & Performance Tuning → Deployment & Ongoing Support 🚀 Ready to transform your ideas into reality? Let's discuss your project requirements and build something amazing together! Consulting, development, urgent tasks, or innovative projects—let's connect!

I help SaaS startups and SMB ship production-ready full-stack applications - from MVP to scalable, multi-tenant systems. With 6+ years of architecting and shipping full-stack systems, I've built SaaS platforms, AI-powered applications, real-time dashboards, and B2B tools handling thousands of active users. 🏆 TOP 3% on Upwork · 🏅 Top Rated Plus · 💯 100% Job Success Score 💪 I use Claude Code and Cursor daily - I pick up existing codebases fast and ship features without hand-holding. ━━━ What I build ━━━ → SaaS platforms with multi-tenant architecture, authentication, and role-based access → AI-powered apps: LLM integration, RAG pipelines, AI agents, OpenAI & Claude API → Real-time dashboards with live data, WebSockets, and complex filtering → Stripe billing flows: subscriptions, Connect, and payment processing → MVPs from zero to production, and existing codebases taken the final mile → No-code handoffs - take over and extend apps built in Lovable, Replit, or Base44 when founders are ready to scale beyond the builder ━━━ Tech I work with daily ━━━ 🎨 Frontend Frameworks & Languages: React · Next.js · TypeScript · JavaScript Styling: Tailwind CSS · Shadcn/ui · Framer Motion State & Data: Tanstack Query · Redux · Zustand · SWR CMS: Contentful · Sanity · Payload CMS · Strapi 🔨 Backend Node.js · NestJS · Fastify · Express.js · REST APIs · GraphQL · WebSocket Database: PostgreSQL · Supabase · MongoDB · Redis · DynamoDB · MySQL Payments: Stripe · Stripe Connect · Stripe Subscriptions · PayPal · Razorpay Observability: Sentry · Grafana ☁️ Cloud & DevOps AWS (Compute: Lambda, EC2, ECS, ELB, Amplify; DB & Storage: RDS, DynamoDB, ElastiCache, S3; Other Services: Cognito, SES, SNS, CloudFront, Route 53, EventBridge) Deployment & CI/CD: Vercel, Render, DigitalOcean, Nginx, GitHub Actions 🤖 AI / LLM OpenAI API · Claude API · LangChain · RAG Pipelines · Vector DBs (Pinecone, Weaviate) · AI Agents 🔗 Integrations: Email: SendGrid · Resend · AWS SES · Mailgun CRM: HubSpot · Mailchimp · Brevo Auth: Auth0 · Clerk · Cognito Analytics: PostHog · Mixpanel Automation: Inngest · Trigger.dev · n8n Search: Algolia · Typesense 🧩 ━━━ Why clients hire me ━━━ I don't just write code; I architect scalable solutions and take full ownership. → Work independently - clear specs are enough; no daily check-ins needed → Fast communication - responses within hours, not days → Proactive updates - you always know where things stand → End-to-end ownership from architecture to deployment on Vercel or AWS 💡 Message me, and I'll respond within a few hours.

🚀 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 • Cloud Infrastructure: Multi-region deployments across AWS (S3, EC2, Lambda, ECS), GCP, Azure, and DigitalOcean. • Modern DevOps: Containerization via Docker, orchestration via Kubernetes, and automated GitHub Actions / GitLab CI/CD pipelines. • System Operations: Ironclad auth (OAuth 2.0, JWT, MFA, RBAC), advanced APIs (REST, GraphQL, WebSockets), and 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 🏆 Why Premium Clients Partner With Me • System Architect: I do not build temporary prototypes; I architect clean code optimized for business growth. • Verified Elite Execution: 12,500+ hours tracking real software development with a 100% satisfaction record. • Full-Time Dedication: Available 40+ hours per week, matching your business hours for live technical strategy ✨ 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

Building a SaaS product, marketplace or internal business platform? I help founders build scalable SaaS platforms, AI-powered applications, marketplaces and mobile apps using React, Next.js, Node.js and React Native. What I've Built: - Multi-tenant SaaS Platforms - Subscription Billing Systems - Marketplace Platforms - Booking & Scheduling Platforms - Operations Management Software - Admin Dashboards with RBAC - AI-powered Product Features - Cross-platform Mobile Apps Over the last 8+ years I've helped startups and businesses launch products ranging from SaaS platforms and operational software to mobile applications, marketplace systems and internal business tools. My Approach: - Clear backend architecture designed for long-term product growth - Organized APIs & predictable data flow - Frontend, backend & mobile applications designed as one product ecosystem - Scalable systems built for long-term product growth - Focus on reliability, maintainability & real-world usage Tech Stack: Frontend: React | Next.js | TypeScript Mobile: React Native | Flutter Backend: Node.js | NestJS | Express.js Databases: PostgreSQL | MongoDB | Redis Infrastructure: AWS | Docker | CI/CD Integrations: Stripe | Firebase | Smart Contract Integrations | OpenAI APIs | REST APIs Recent work includes: - Investment platform - Resort operations system - Marketplace - Property management - Healthcare platform - Logistics platform - AI-powered educational platform Industries I work on: SaaS • Healthcare • Mental Wellness • Fintech • Real Estate • Marketplace Platforms • E-commerce • EdTech • Operations Software • Social Platforms Whether you're building a new SaaS product, launching an MVP, developing a mobile application or improving an existing platform, I can help take the project from planning and architecture through development, deployment and ongoing support. Keywords: SaaS Developer | SaaS Product Development | SaaS MVP Development | SaaS Architecture | Full-Stack SaaS Developer | Web & Mobile App Development | React Native Developer | AI Integration | Payment integration | Stripe Integration | React & Node.js Developer | Next.js Developer | Node.js Developer | NestJS Developer | API Development | REST API Design | Backend Architecture | Scalable API Systems | Database Design | PostgreSQL | MongoDB | Redis Caching | Admin Dashboard Development | Role-Based Access Control (RBAC) | Workflow Systems | Automation Systems | Payment Systems Integration | Stripe Integration | Blockchain API Integration | Wallet Integration | AI Features Integration | OpenAI API | Marketplace Platforms | Booking Systems | Android Development | iOS Development

Struggling to find a developer who actually delivers — on time, on budget, without the back-and-forth headaches? Let's fix that. I'm Shubham — a Full-Stack, AI & Web3 Developer with 4+ years of experience turning ideas into production-ready apps. Here's what my Upwork track record looks like: 📊 20+ projects completed | 100% Job Success | 5.0 ★ on every contract | $6K+ earned | 0 missed deadlines That's not luck — it's process. I treat every project like a product launch, not a freelance gig. WHAT I SOLVE FOR YOU: ✅ "I need a full app built — but I don't want to manage 5 different freelancers." → I handle everything end-to-end: frontend (React, Next.js), backend (Node.js, Django), database (PostgreSQL, MongoDB, Supabase), deployment (AWS, Vercel) — and mobile (React Native, Flutter). One developer. All platforms. Ship faster. ✅ "I want AI in my product, but don't know where to start." → I've built AI chatbots, AI agents that automate business workflows, and LLM-powered features using Claude API, OpenAI, and LangChain. I also use Cursor, Bolt, and Lovable to prototype 3x faster — meaning you get working demos in days, not weeks. ✅ "I need a Web3 app — smart contracts, DApp, the whole stack." → I develop on Solana and Ethereum — smart contracts (Solidity, Rust), wallet integration, token-gated access, NFT platforms, and DeFi dashboards. Full Web3 stack from contract to frontend. ✅ "I've been burned by developers who ghost or deliver broken code." → My clients don't have that problem. One said, "Shubham executed so much in such a short amount of time, with so little input from me needed. Very impressive!" — I communicate daily, write documented code, and deliver deployment-ready builds, not half-finished repos. RECENT RESULTS: → Built a complete auction platform with Boogable API integration — delivered ahead of client's timeline (5.0 ★) → Developed a custom retail hire portal with complex API integration — client gave "Solution Oriented" badge (5.0 ★) → Created a headless Next.js + WordPress auction website from scratch — 2 five-star reviews on one contract → Shipped a React-based data lineage visualisation tool — delivered in 8 days (5.0 ★) → Built a decentralised media & content platform (DeHub) — live and functional TECH STACK: Frontend: React, Next.js, TypeScript, Tailwind CSS Mobile: React Native, Flutter (iOS + Android) Backend: Node.js, Django, Python, Express Database: MongoDB, PostgreSQL, Supabase, Firebase AI: Claude API, OpenAI API, AI Agents, LangChain Web3: Solidity, Rust, Solana, Ethereum, Anchor, Hardhat Deploy: AWS, Vercel, Docker, CI/CD Integrate: Stripe, Shopify, WordPress (headless), GraphQL, REST APIs WHAT YOU GET WORKING WITH ME: → A clear project plan within 24 hours of hire → Daily progress updates (async or call — your choice) → Clean, documented, production-grade code → Deployment-ready delivery with post-launch support → Someone who actually cares about YOUR business outcome, not just closing a ticket Available right now for fixed-price or hourly work. Drop me your project details — I'll reply within a few hours with a free plan and honest estimate. No fluff, no surprises.