Design Bitly’s Redirect Path · System Design Interview

Design Bitly’s Redirect PathDesign only the redirect half of a link shortener at Bitly’s size: a short code arrives and the browser has to be sent onwards almost immediately, from anywhere in the world. Latency, read scaling and caching are the whole exercise.What it has to do

A short code resolves to its destination and the visitor is redirected there

A link that has been deleted or has expired stops redirecting

Every click is counted, without the visitor waiting for the count

Scale

Redirects per day: 2 billion

Links stored: 20 billion

Out of scope

Creating links and generating codes

Accounts and dashboards

Custom domains

Analytics reporting

Malware and spam checks

Practise this challengeAll system design challenges

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