Designs

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  49. Design an Online Auction like eBay

  Take bids on 10 million live auctions with one consistent highest bid, lose none, push the price to every watcher and end each auction fairly.

  ClassicMedium

  StreamingConcurrencyDistributed systems

  +7

  AuctionsAuroraAWSContentionKafkaReal timeServer sent events

  Worked design

  Practice
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  60. Design Live Comments like Facebook Live

  Live comments for millions of viewers: SSE streams, a Redis channel per video with co-located viewers, sampling and CDN snapshots for hot videos.

  ClassicMedium

  DatabasesAWSDynamoDB

  +5

  Fan outLive commentsReal timeRedis Pub/SubServer sent events

  Worked design

  Practice

Each design brings together the brief, practice, examples and discussion.