Design a URL shortener

What you will work through

1. 1
   Requirements

   Clarify the link and redirect boundary

2. 2
   Scale estimates

   Estimate redirect skew and code growth

3. 3
   Core entities

   Model mappings, owners, and lifecycle

4. 4
   API design

   Specify create and redirect contracts

5. 5
   Data model

   Choose a short-code lookup store

6. 6
   Architecture

   Trace the cached redirect path

7. 7
   Bottlenecks

   Contain viral-code hot spots

8. 8
   Reliability

   Degrade without losing redirects

9. 9
   Final design

   Defend the URL-shortener design