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Real Time Guides

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Real Time in System Design

2 in-depth guides covering how real time is used in real system design interviews. Learn when to use it, its trade-offs, and how to discuss it with confidence at companies like DoorDash, Uber, Amazon.

Dec 5, 2025•22 min
How to Design DoorDash - Complete System Design Guide
Master DoorDash system design for your next big tech interview. Covers the three-sided marketplace architecture, order state machine, dasher dispatch with geoha...
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Oct 10, 2025•20 min
How to Design a Chat System (Real-Time Messaging) - Complete System Design Guide
Master chat system design for your next big tech interview. Learn WebSockets, message delivery guarantees, Cassandra schema design, fan-out for group chats, pre...
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Go Beyond Reading About Real Time

Real Time concepts show up across many system design interviews. Practice applying them in full interview simulations and get actionable feedback.

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Related Technologies

KafkaWebsocketsDistributed SystemsChatCassandra

Companies That Test Real Time

AmazonAppleDoorDashGoogleGrubhubInstacartLyftMetaMicrosoftUber