Tiktok System Design interview

Functional Requirement

• User should be able to
  • upload videos
  • watch videos
  • like/share videos

Reduced scope

We can skip with interview permission

• Sign up / Login part
• Actual APP side architecture

Non Functional Requirement

• Highly available
• Scalable
• Low latency
• Support multiple devices

Metrics

• 1B user * 150 countries
• 1B videos viewed per day
• 10B videos uploaded per day

Success metric: time in app – maximize

(1 hours per day)

• Details assumptions
  • 1 MB per video (1080 * 1920 px)
  • 10 sec video on avg
• Total Storage per year = (1 video size) * (Number of videos uploaded per year)
  • 1MB * 10Bil = 10⁶ * 10* 10⁹ = 10* 10¹⁵ = 10 PB storage required per year

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