Design an ML URL Shortener

HardSystem Design00:00

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Your question is Design an ML URL Shortener. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

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Problem

Scenario

You are building a URL shortening service that creates short links and redirects users to the original destination. The product also wants to detect abusive links, predict suspicious traffic, and optimize redirect handling using machine learning.

Question

How would you design a URL shortening service?

What This Tests

ML retrieval and ranking for abuse detection
Low-latency model serving alongside a highly available redirect path
Feature freshness, drift, and delayed feedback loops
Fallbacks when models or feature systems fail