# Posts tagged with "databases"

[Design a Chat System Like WhatsApp: System Design Walkthrough  
Step-by-step guide to designing a real-time chat system in a system design interview. Covers WebSockets, message storage, fan-out, delivery receipts, and push notifications.](/content/blog/design-chat-system-like-whatsapp/index.html)  
[Design a URL Shortener: Complete Walkthrough  
Step-by-step guide to solving one of the most popular system design interview questions.](/content/blog/design-url-shortener-complete-walkthrough/index.html)