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Race Condition in Frontend(react) — Explained with a Food Delivery App

2d ago · 2 min read · Imagine you open a food delivery app and check: "Restaurants near Amritsar" Request A goes to the server. Before it finishes, you quickly change location to: "Restaurants near Chandigarh" Request B go

How to send backend response quickly when having 15 await functions

6d ago · 4 min read · I was working on a WhatsApp AI chatbot recently and hit one of the most important backend architecture problems I’ve faced so far: Meta’s webhook timeout rule. Here’s the complete breakdown of how I s

Javascript event loop expained

May 9 · 2 min read · JavaScript runs on a single thread, meaning it can only do one thing at a time. But why we need event loop? without it we could not run functions asynchronously. Gmeet without event loop streamVideo()

Solving a Race Condition in Whatsapp Express AI app with PostgreSQL Advisory Locks

May 7 · 4 min read · Never Accidentally Send Duplicate WhatsApp AI Replies — Solving a Race Condition in Express.js with PostgreSQL Advisory Locks I was building a WhatsApp webhook API flow like this: WhatsApp Webhook → E