• Design a Messenger

Key points:

• Websocket for notifications
• Queue for reliable message delivery
• NoSQL db for fast access to messages###### Relative links:
• Relational DB for user info
• Object storage (S3) for media files
• Fast in-memory storage (like Redis) for implementing presence

• https://newsletter.systemdesign.one/p/whatsapp-system-design
• https://www.systemdesignhandbook.com/guides/design-a-chat-system/
• https://bytebytego.com/courses/system-design-interview/design-a-chat-system
• https://www.geeksforgeeks.org/system-design/desiging-facebook-messenger-system-design-interview/

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