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Queues & Async Processing System Design Questions

12 design prompts lean on queues & async processing. Each one runs on a whiteboard canvas with AI feedback graded against a hidden rubric.

New to queues & async processing? There's a free 5-lesson interactive course (~50 min) with animated architectures and runnable simulations. Learn the concept first →

Design problems

News Feed

Design a social news feed like Instagram's or Facebook's home feed.

CachingDatabase Scaling

Chat Messaging

Design a real-time chat and messaging service like WhatsApp or Messenger.

Consistency & Trade-offsDatabase Scaling

Notification System

Design a multi-channel notification system (push, email, SMS).

Load Balancing & Scaling

Collaborative Editor

Design a real-time collaborative document editor like Google Docs.

Consistency & Trade-offs

File Sync

Design a file sync and storage service like Dropbox or Google Drive.

Consistency & Trade-offsDatabase Scaling

Message Queue

Design a distributed message queue like Kafka or SQS.

Consistency & Trade-offsLoad Balancing & Scaling

Ride Matching

Design the ride-hailing dispatch and matching system for a service like Uber or Lyft.

Consistency & Trade-offsLoad Balancing & Scaling

Ticketing System

Design an event ticketing system like Ticketmaster.

Consistency & Trade-offsDatabase Scaling

Payment Processing

Design a payment processing system like Stripe.

Consistency & Trade-offsDatabase Scaling

Web Crawler

Design a large-scale distributed web crawler.

CachingDatabase Scaling

Ad Click Aggregator

Design a real-time ad click aggregation system.

Consistency & Trade-offsDatabase Scaling

Recommendation System

Design a personalized recommendation system like Netflix's.

CachingDatabase Scaling

Want the pressure version? Any of these can run as a live 45-minute design interview with follow-up questions and a verdict. Set up a design interview