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Interview question · Application & API Security

How do you find business logic flaws that scanners cannot?

Model a bounded reservation workflow, run an offline invariant fixture, and reason about retries, contention, immutable intent and uncertain external outcomes.

hardNewPreparation tags: Amazon, Salesforce, MetaUpdated Nov 2026

Model a bounded reservation workflow, run an offline invariant fixture, and reason about retries, contention, immutable intent and uncertain external outcomes.

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What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 4 follow-ups like an interviewer would

A workshop service has three available seats. Reservations temporarily consume capacity, confirmation finalizes the booking, and cancellation may release only a held reservation.

  1. What if two workers each observe three free seats?
  2. What if a retry reuses the key with a different quantity?
  3. What if confirmation times out and cancellation arrives?
  4. What evidence would justify accepting the corrected design?

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