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Field notes, essays, and tutorials on engineering, design-engineering, and the slow work of making software last. Newest first.

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The Shipping Email Went Out Twice.

order-9912 shipped once. The customer got two emails. The second one was the same fact, delivered again.

One tracking link gets shared a million times. Design the two APIs — and the cache — so the redirect holds when a single code is on fire.

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