Section 01
Caching
0 / 4
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The Same Read 50,000 Times
Medium
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Inventory Is Wrong
Hard
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Midnight Cache Explosion
Medium
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Celebrity Hot Key
Medium
Section 02
CDNs & Edge Delivery
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Australia Is 600ms Away
Medium
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The CDN Serves Old JavaScript
Easy
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Personalized Pages at the Edge
Easy
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Origin Shield Under Viral Traffic
Easy
Section 03
Queues & Background Processing
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Checkout Takes Eight Seconds
Medium
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The Backlog Keeps Growing
Hard
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The Poison Job
Easy
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Priority Matters
Hard