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I will build ai saas and custom chatbot using mern stack and openai
Rohan Mandal
About this gig
Stop building generic "ChatGPT Wrappers." You need a custom AI solution that actually understands your business data. If you are looking to build a scalable AI SaaS, a Custom RAG Chatbot, or integrate AI into your existing MERN Stack application, I am the engineer you need.
I don't just connect an API and leave. I build robust, production-ready architectures where your AI does not just talk but actually works with your specific data using Vector Databases and LangChain.
WHAT I BUILD :
- Custom RAG Pipelines: Chat with your PDFs, CSVs, or Notion docs using Pinecone/ChromaDB.
- AI SaaS: Full-stack React & Node.js applications with Auth, Database, and Stripe payment integration.
- Chatbots: Custom agents trained on your brand tone, capable of lead generation and customer support.
- API Integration: Seamlessly add OpenAI or Google Gemini models to your legacy web apps.
MY TECH STACK:
- Frontend: React.js, Tailwind CSS .
- Backend: Node.js, Express.js .
- AI : LangChain, LlamaIndex, OpenAI API, Gemini.
- Database: MongoDB , Pinecone (Vector Embeddings).
- Deployment: Hostinger, Vercel, or Render for zero-downtime performance.
Note: You provide the vision (and API keys), I build the engine.
Get to know Rohan Mandal
Rohan Mandal
Web Developer
- FromIndia
- Member sinceJan 2026
- Avg. response time1 hour
Languages
English
I am a Full Stack Web Developer specializing in Next.js, React, TypeScript, Tailwind CSS, and modern web application development. I have hands on experience building fast, responsive, SEO friendly websites and scalable websites that support real business growth.
Every project is custom built from scratch with clean code, performance optimization, responsive design, and user experience in mind. I focus on custom website development, SaaS applications, landing pages, eCommerce websites, API integrations, AI chatbot solutions, website redesign, bug fixing, maintenance, and SEO optimization.
My Portfolio
FAQ
Can the AI chatbot be trained on my own custom data (PDFs/Website)?
Yes! I specialize in building Custom RAG (Retrieval-Augmented Generation) pipelines. I use LangChain and Vector Databases (like Pinecone or MongoDB) to allow the AI to read your PDFs, CSVs, or website data and answer questions accurately without hallucinations.
What technology stack do you use for building AI SaaS applications?
I strictly use the MERN Stack (MongoDB, Express, React, Node.js) for the application layer. For the AI integration, I use LangChain, OpenAI API, or Google Gemini, ensuring your app is modern, scalable, and fast.
Do I need to provide my own OpenAI or Gemini API key?
es. You will need to provide your own API Key (OpenAI/Anthropic/Gemini). This ensures you have full ownership of the account and control over your usage costs. I will help you optimize the code to minimize token usage and save money.
Can you integrate AI into my existing React or Node.js website?
Yes, I can seamless integrate GenAI capabilities into your existing MERN Stack project. I will write clean, modular code to add features like chatbots, summarizers, or content generators without breaking your current site architecture.
Will you help with deployment on Hostinger, Vercel, or Render?
Yes, I can handle the full deployment process on Hostinger, Vercel, or Render to ensure your MERN app and GenAI integration are live. Please note: Deployment is NOT included in the base packages and must be added as a 'Paid Extra' during checkout.
