---
title: "Discussion on \"System Design Drill Day 3: Queues and Async Jobs for Checkout\" | Hashnode"
description: "Discussion on \"System Design Drill Day 3: Queues and Async Jobs for Checkout\". Why slow work belongs on a queue, what at-least-once delivery means, and how retries and idempotency keep background jobs safe."
url: "https://hashnode.com/posts/system-design-drill-day-3-queues-and-async-jobs-for-checkout/6ad80fec25082b988064d76b"
---

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# [System Design Drill Day 3: Queues and Async Jobs for Checkout](https://blog.anishansari.com.np/system-design-drill-day-3-queues-and-async-jobs-for-checkout?utm_source=hashnode&utm_medium=feed)

Why slow work belongs on a queue, what at-least-once delivery means, and how retries and idempotency keep background jobs safe.

Oct 21 · 8 min read · blog.anishansari.com.np  
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## Written by

[Anish Ansari](https://hashnode.com/@anish78)

@anish78 · kathmandu, Nepal

  
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