I will build ai chatbot rag app and llm integration with langchain nextjs

M
mohosin2126
M
mohosin2126
Md Mohosin Ali
build ai chatbot rag app and llm integration with langchain nextjs
build ai chatbot rag app and llm integration with langchain nextjs
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build ai chatbot rag app and llm integration with langchain nextjsbuild ai chatbot rag app and llm integration with langchain nextjsbuild ai chatbot rag app and llm integration with langchain nextjsbuild ai chatbot rag app and llm integration with langchain nextjs

About this gig

Need an AI chatbot that answers from your own documents, or an AI feature built into your existing app that works in production?


I built RepoLens, an AI platform ranked #7 Product of the Day on Product Hunt, with grounded chat over indexed code. I also built a system with multi-provider LLM fallback across OpenRouter, Gemini, OpenAI, and Anthropic.


What I can build:

  • AI chatbots grounded in your PDFs, docs, database, or website (RAG)
  • AI chat widgets for React, Next.js, or any existing site
  • LLM dashboards, summarization, and classification
  • Automatic tagging, priority scoring, and sentiment analysis
  • AI agent workflows with tool calling and multi-step reasoning
  • OpenAI, Anthropic, Gemini, and OpenRouter integration via LangChain
  • Vector search and embedding pipelines
  • Background processing with Redis and BullMQ for long AI jobs


Why this beats a basic API wrapper:

  • Multi-provider fallback keeps your app running if one provider fails
  • Answers grounded in your real data with source references
  • Async processing so users get instant responses
  • Zod validation so bad LLM output never breaks your app


Message me before ordering with your use case and data sources.

  • Application Type

    • Web Application

  • AI Type

    • Chat
    • Booking
    • Finance
    • Productivity Tools
    • E-commerce
    • Custom

  • Programming Language

    • JavaScript
    • TypeScript
    • React

  • Web Frameworks

    • React
    • Vue.js
    • Express.js (Node.js)
    • Next.js

  • Desktop Frameworks

    • Electron

  • No & Low-Code Builders

    • Firebase Studio
    • Replit

Get to know Md Mohosin Ali

Md Mohosin Ali

Full Stack Developer React Nextjs Vue Nodejs SaaS Dashboard Expert

5.0(3)
  • FromBangladesh
  • Member sinceDec 2023
  • Last delivery11 months

  • Languages

    Bengali, English
Hi, I am Mohosin, a Full Stack Developer with 3+ years of experience specializing in React, Nextjs, Vue, TypeScript, Nodejs, Expressjs, REST API, GraphQL, MongoDB, MySQL, Firebase, AI app development, chatbot integration, and agentic AI workflows. I build SaaS dashboards, admin panels, CRM, ERP, POS, eCommerce, booking, and custom web apps with clean code, responsive design, secure authentication, API integration, scalable architecture, real-time features, and performance optimization. I also built RepoLens, ranked 7 Product of the Day on Product Hunt.

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