---
title: "Discussion on \"How I'd Design a Chat System Like WhatsApp — WebSockets, Message Delivery, and Scaling to Millions\" | Hashnode"
description: "Discussion on \"How I'd Design a Chat System Like WhatsApp — WebSockets, Message Delivery, and Scaling to Millions\". A practical system design breakdown covering 1-on-1 and group messaging, delivery guarantees, and the architecture decisions that actually matter in production"
url: "https://hashnode.com/posts/how-i-d-design-a-chat-system-like-whatsapp-websockets-message-delivery-and-scaling-to-millions/69e21e770da33f77113bbd1a"
---

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Discussion

# [How I'd Design a Chat System Like WhatsApp — WebSockets, Message Delivery, and Scaling to Millions](https://blog.madhav.dev/how-i-d-design-a-chat-system-like-whatsapp-websockets-message-delivery-and-scaling-to-millions?utm_source=hashnode&utm_medium=feed)

A practical system design breakdown covering 1-on-1 and group messaging, delivery guarantees, and the architecture decisions that actually matter in production

Apr 17 · 15 min read · blog.madhav.dev  
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-   [#system-design](https://hashnode.com/tag/system-design)
-   [#websockets](https://hashnode.com/tag/websockets)
-   [#aws](https://hashnode.com/tag/aws)
-   [#python](https://hashnode.com/tag/python)
-   [#kafka](https://hashnode.com/tag/kafka)
-   [#backend](https://hashnode.com/tag/backend)

## Written by

[Madhav Bhasin](https://hashnode.com/@madhavbhasin)

@madhavbhasin · Noida, India

  
[View profile](https://hashnode.com/@madhavbhasin)

Production patterns for backend engineers who are tired of hello-world tutorials.

Senior full-stack engineer and engineering lead with 5+ years building cloud-native systems at scale. I write about the things the docs don't cover — GCP, FastAPI, Terraform, event-driven architecture, and AI-powered backends. No hello-world demos.

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