Build a RAG App with LangChain, OpenAI & Node.js — Step by Step
How I built a Retrieval-Augmented Generation system at India Today Group for intelligent article search and content automation using LangChain, OpenAI, and MongoDB Atlas Vector Search.
Tech blogReact · AI · Architecture202 articles
Tech blog · India · page 5
Tech blogs on code, architecture and AI.
Deep dives into React.js, AI and ML integration, MERN stack patterns, and lessons from building production applications at scale in India — written by Deepak Kumar.
What it covers
- javascript88 articles
- node.js80 articles
- Engineering73 articles
- devops51 articles
+ 388 more topics in the archive
202 articlesLatest · Oct 2026
Showing 51 articles tagged Node.js. Clear filter
Sponsored postsNewHave a dev or AI product? Sponsor a post on this blog.Starts at only ₹999 per postSee how it works →MERN Stack Architecture in 2026: What's Changed & Best Practices
How I architect MERN stack applications in 2026 — MongoDB Atlas, Express with TypeScript, React Server Components, Node.js 22, and the tools that replaced Redux.
Engineering India Today's Election Dashboard: Real-Time Data at Scale
Behind the scenes of building India Today's live election results dashboard — handling 10,000+ constituency results in real-time with WebSockets, React, and Node.js.
About the author
Deepak Kumar
Sr Software Engineer at India Today Group | Aaj Tak
Building scalable web applications and Generative AI systems. Writing about React, Node.js, AI and the engineering lessons from 9+ years of production work.
More about meHiring, or need something built?
Open to senior full-stack and AI engineering roles, and to focused contract work. Delhi NCR or fully remote. I reply within 24 hours.
What I take on
Full-stack product build
React, Next.js, Node, NestJS, MongoDB and MySQL — from idea to production.
AI features that ship
OpenAI and LangChain, RAG, semantic search, content and voice automation.
Architecture and scale
Microservices, real-time pipelines and caching — proven at national news scale.
Founding engineer work
Idea to MVP to scale, with SEO and analytics built in from the start.