--- title: "Rajat Gupta (@rajatetc) | Hashnode" description: "Fullstack Development | Javascript | React | Express. Read the latest articles by Rajat Gupta on Hashnode." url: "https://hashnode.com/@rajatetc" --- @rajatetc # Rajat Gupta @rajatetc · Delhi, India · Joined November 2020 Fullstack Development | Javascript | React | Express [Website](https://rajatgupta.site/) ### [Building RepoGrok — an AI chat for any JavaScript codebase](https://guptarajat.hashnode.dev/building-repogrok-an-ai-chat-for-any-javascript-codebase?utm_source=hashnode&utm_medium=feed) How I built RepoGrok — a RAG app that parses JS/TS repos into AST chunks, embeds them via Cloudflare, and chats about code using Gemini. 9 min read · [guptarajat.hashnode.dev](https://guptarajat.hashnode.dev/building-repogrok-an-ai-chat-for-any-javascript-codebase?utm_source=hashnode&utm_medium=feed) [May 15](https://hashnode.com/posts/building-repogrok-an-ai-chat-for-any-javascript-codebase/6a073b3f73afc887577fdb9c) ### [From Express to NestJS: Scaling Our Job Scheduler Architecture](https://guptarajat.hashnode.dev/from-express-to-nestjs?utm_source=hashnode&utm_medium=feed) As our team's job scheduling service grew from handling a single cron job to becoming a central piece of our infrastructure, we faced the classic engineering challenge of scaling our architecture. This post details our journey of migrating from a sim... 5 min read · [guptarajat.hashnode.dev](https://guptarajat.hashnode.dev/from-express-to-nestjs?utm_source=hashnode&utm_medium=feed) [Jan 8, 2025](https://hashnode.com/posts/from-express-to-nestjs/677e7a4595e1daeb4e3da68c) ### [#1 Checkpoint: Of Debugging & Deadlines](https://guptarajat.hashnode.dev/checkpoint-1?utm_source=hashnode&utm_medium=feed) reflecting on mistakes & learnings from the first 3 months of the first job 7 min read · [guptarajat.hashnode.dev](https://guptarajat.hashnode.dev/checkpoint-1?utm_source=hashnode&utm_medium=feed) [5](https://hashnode.com/posts/checkpoint-1/614dc24811be385cc5771b25) [Sep 24, 2021](https://hashnode.com/posts/checkpoint-1/614dc24811be385cc5771b25) ### [🧑‍🏫 Unacademy Interview Experience - Software Engineer, Web](https://guptarajat.hashnode.dev/unacademy-interview?utm_source=hashnode&utm_medium=feed) In this article - I will share how I got the opportunity, interview experience, tips, and the resources that helped me. 4 min read · [guptarajat.hashnode.dev](https://guptarajat.hashnode.dev/unacademy-interview?utm_source=hashnode&utm_medium=feed) [9](https://hashnode.com/posts/unacademy-interview/60d7f7a3cb0aa8118c23c0f0) [Jun 27, 2021](https://hashnode.com/posts/unacademy-interview/60d7f7a3cb0aa8118c23c0f0) ### [💡Know The Differences Between Event Capturing, Bubbling & Delegation in JS](https://guptarajat.hashnode.dev/events-1?utm_source=hashnode&utm_medium=feed) Do you get confused 😵 about the order in which event listeners are invoked when you click on an element? Then this is for you. Also, a hot 🔥 interview Q! 5 min read · [guptarajat.hashnode.dev](https://guptarajat.hashnode.dev/events-1?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/events-1/60b4d6e85433795589b8603e) [May 31, 2021](https://hashnode.com/posts/events-1/60b4d6e85433795589b8603e)