03 / 09PremiumSearch

YouTube Video Search

Retrieve and rank relevant videos for short, ambiguous queries using text, visual and audio signals across billions of videos.

Read time
8 min
Diagrams
2 architecture
Key metric
NDCG and watch time
Difficulty
Hard
Two-tower modelQuery understandingMulti-stage ranking
YouTube Video Search illustration

Step 01 · Problem statement

Interviewer

What is the core problem a YouTube Video Search system aims to solve, and what are its key challenges?

What's inside this design

  1. 01Problem Statement
  2. 02Identify Metrics
  3. 03Train and Evaluate Model
  4. 04Design the System
  5. 05Scale the Design
  6. 2 architecture diagrams