Entertainment

How to build Netflix

Video streaming platform with personalized recommendations, adaptive bitrate streaming, and content management.

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Features (10)

Adaptive bitrate streaming (ABR)

Personalized recommendation engine

Content delivery via CDN

Multi-profile accounts

Offline downloads

Search with auto-suggest

Watchlist management

Parental controls

Subtitle/audio tracks

A/B testing framework

User Stories (5)

As a user, I can browse and search a catalog of movies and shows

As a user, I can stream content with adaptive quality

As a user, I can get personalized recommendations based on watch history

As a user, I can create profiles with separate preferences

As an admin, I can upload and manage content with metadata

Suggested Tech Stack

ReactNode.jsCassandraElasticsearchKafkaRedisAWS S3CloudFront CDNSpark ML

Non-Functional Requirements

Category	Requirement	Target
Performance	Video start time	< 2 seconds on broadband, < 5s on mobile
Performance	Adaptive bitrate	Switch quality within 1 buffer segment (2-4s)
Scalability	Concurrent streams	10M+ simultaneous streams globally
Availability	Uptime SLA	99.99% — streaming interruptions cause churn
Security	Content protection	DRM (Widevine/FairPlay), geo-restrictions enforced
Observability	Stream quality	Per-session bitrate, rebuffer ratio, error rate dashboards

Release Milestones

MVPBasic Streaming

Video catalogSingle quality playbackUser authenticationBasic search

v1.0ABR & Profiles

Adaptive bitrate streamingMulti-profile supportWatchlistContinue watching

v2.0Personalization

Recommendation engineA/B testingOffline downloadsParental controls

Acceptance Criteria

Video plays within 2s of clicking on broadband connections

Quality adapts smoothly when bandwidth drops (no buffering spinner)

Recommendations improve click-through rate by > 20% vs random

Downloaded content plays fully offline with DRM validation

Success Metrics

Average viewing time per session: > 1.5 hours

Rebuffer ratio: < 0.5%

Recommendation click-through rate: > 35%

Monthly churn rate: < 2%

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