Designs

Company tags are community-reported. Counts on cards show how many people reported that design.

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  6. Design a News Feed

  Build a paginated feed that handles high-fan-out authors, fresh posts and visibility changes.

  ClassicMedium

  CachingDatabasesStreaming

  +11

  PrivacyDistributed systemsAWSDynamoDBFan outKafkaNews feedPaginationRedisSocialTimeline

  Worked design

  Practice
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  31. Hybrid Fan-Out (Push and Pull)

  Building a timeline when someone opens the app means reading from everyone they follow and merging — slow, and slowest for the most active users. Building it when someone posts makes reads a single lookup, but one post by an account with fifty million followers becomes fifty million writes.

  Product & backendMedium

  CachingDatabasesFan out

  +3

  News feedRedisTimeline

  Worked design

  Practice

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