Playground

Interactive simulators

Each simulator models a real engineering problem. Toggle the safeguard off to see the failure, on to see the fix.

The Double-Tap Pay Button

Rule 4: Anything Can Happen Twice

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The Race for the Last Seat

Rule 6: Two Requests at Once

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The Traffic Surge

Rule 8: Queues and Back-Pressure

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The Polite Retry

Rule 9: Retry With Care

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All-or-Nothing Transfer

Rule 5: All or Nothing

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The Order Journey

Rule 11: Make State Explicit

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