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Security, auth & multi-tenancyHardStaff
Design a central authorisation service that all product teams call to answer 'can user U do action A on resource R?'. It needs p99 under 10 ms and must handle 1 million checks per second.
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AtlassianGoogleMicrosoft
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Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
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