Real-Time | System Designhttps://system-design.devops-monk.com/tags/real-time/In-depth system design tutorials — from zero to millions of users. Written for engineers who want to understand how large-scale systems actually work.en-usabhaypratap3537@gmail.com (Abhay)abhaypratap3537@gmail.com (Abhay)Sun, 06 Sep 2026 22:11:29 +0000Design Nearby Friendshttps://system-design.devops-monk.com/2026/06/design-nearby-friends/Fri, 05 Jun 2026 10:00:00 +0000https://system-design.devops-monk.com/2026/06/design-nearby-friends/abhaypratap3537@gmail.com (Abhay)Case Studies333,000 location updates a second turn into 13.3 million messages a second. Why moving people are a completely different problem from static businesses — WebSocket fan-out, Redis Pub/Sub as a routing layer, and an interactive calculator for the amplification that decides the whole design.Design Nearby Friends

333,000 location updates a second turn into 13.3 million messages a second. Why moving people are a completely different problem from static businesses — WebSocket fan-out, Redis Pub/Sub as a routing layer, and an interactive calculator for the amplification that decides the whole design.

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]]>Design a Chat Systemhttps://system-design.devops-monk.com/2026/06/design-chat-system/Mon, 01 Jun 2026 14:00:00 +0000https://system-design.devops-monk.com/2026/06/design-chat-system/abhaypratap3537@gmail.com (Abhay)Case StudiesBuild a Messenger-style chat system for 50 million daily users. Why WebSocket beats polling, how server-assigned sequence numbers guarantee ordering, multi-device sync, presence with heartbeats, and the reconnect problems that only appear in production.Design a Chat System

Build a Messenger-style chat system for 50 million daily users. Why WebSocket beats polling, how server-assigned sequence numbers guarantee ordering, multi-device sync, presence with heartbeats, and the reconnect problems that only appear in production.

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