Design a Link-in-Bio Service

Requirements

• •Allow users to create a public profile page with a unique username slug
• •Allow adding, editing, reordering, and removing links on their page
• •Serve the public profile page at /{username} with all active links
• •Track click counts per link
• •Support a custom profile photo and bio text

Non-Functional Requirements

• •Profile page load < 100ms (p99, cached)
• •Supports creators with up to 1M profile views/month
• •Link updates should be visible within 5 seconds
• •System handles ~10,000 active creator profiles

Constraints

• •Single region deployment
• •Users are authenticated to manage their profile (auth is out of scope)
• •No need for A/B testing or scheduled link visibility in v1

Evaluation Criteria