T

Master TikTok

Recommendation Engine

1B+
Active Users
1M+ videos/day
Scale
99.9%
Uptime
Start HereEasy

Design Video Upload

Handle short video uploads with effects.

UploadEffectsValidationProcessing
Start Problem

All Problems

9 challenges to master TikTok's architecture

CoreHard

Design Video Feed

45 min

Build an infinite scrolling video feed.

Feed AlgorithmPreloadingCaching+1 more
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MLHard

Design Recommendation Engine

45 min

Recommend videos that maximize engagement.

Watch TimeEngagement SignalsExploration+1 more
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TrustHard

Design Content Moderation

40 min

Moderate content at scale with ML.

ML ClassificationHuman ReviewAppeals+1 more
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ContentMedium

Design Sound Library

35 min

Manage and serve trending sounds.

Audio FingerprintingTrending DetectionLicensing+1 more
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CoreMedium

Design Duet/Stitch Feature

35 min

Enable video responses to other videos.

Video CompositionAttributionLayout+1 more
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AnalyticsMedium

Design Creator Analytics

30 min

Analytics for content creators.

ViewsEngagementDemographics+1 more
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MediaHard

Design Effects Engine

40 min

Apply real-time AR effects to videos.

AR FiltersFace DetectionGPU Processing+1 more
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DiscoveryEasy

Design Hashtag System

25 min

Organize content with hashtags.

TaggingTrendingSearch+1 more
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Real-timeHard

Design Live Streaming

45 min

Enable live video with gifts.

Low LatencyGiftsChat+1 more
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