Reliability

Backend & APIs

A Webhook With No Retry Policy Is a Notification You Will Never Receive

Webhooks are push notifications that depend on the receiver being available at the exact moment the event occurs, and a…

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System Design

A Message Queue Is a Contract About Delivery, and the Contract Has Terms

A message queue promises to deliver messages, but the promise has terms — at-least-once, at-most-once, ordering, and retries — and…

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Databases & Data Engineering

A Backup You Have Never Restored Is a Hope, Not a Plan

The only way to know a backup actually works is to restore it, and a backup that has never been…

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