Design a Webhook Delivery Service · System Design Interview

Design a Webhook Delivery ServiceDesign the service that calls a customer’s URL whenever something happens in their account, and keeps trying if their server is slow, down, or wrong.What it has to do

An event triggers a call to every URL the customer has registered for it

A delivery that fails is retried with backoff, and eventually given up on

A customer can verify a delivery genuinely came from us

Scale

Events per day: 2 billion

Registered endpoints: 3 million

Deliveries per second at peak: 300,000

Out of scope

The events themselves and what produces them

The customer’s own endpoint

A UI for configuring webhooks

Practise this challengeAll system design challenges

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