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Instagram Feed System Design
Visual Problem Diagram
Scenario
You post a Reel on spotty LTE. The app says "posted" in two seconds—but playback stutters because only a poster frame exists while the full bitrate ladder is still encoding. Your friend's feed still shows yesterday's order because fan-out is backed up. Instagram-shaped interviews grade media pipeline + hybrid feed together: upload ack is not full transcode, and an influencer post cannot fan out to fifty million mailbox writes.
Design an Instagram-style home feed with photo and video posts, a following graph, ranking, and optional stories. Media upload and CDN sit alongside social feed mechanics—both must be addressed in the same interview.
Constraints
Constraints will be defined in the Requirements stage.
Stages ahead
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