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URL shortener by Robin Singh · Diagramly

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URL shortener

Robin SinghOctober 13, 2026

Classic system design: writes, cached reads, ID generation and click analytics.

Offered as a template

Diagram: URL shortener

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In this diagram

URL shortener
Users
browser · API
Load balancer
Shorten API
POST /links
Redirect API
GET /:code → 301
ID generator
base62 · ranges
Links DB
Redis cache
Click events
Analytics worker
Reads ≫ writes: cache hot codes, fall back to DB
next id
save
lookup
miss

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