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Interview question · Systems, OS & Memory Safety

Design a sandbox for a document parser that processes untrusted uploads, such as PDFs and Office files feeding a RAG index.

Assume the parser will be exploited, then decide what the exploit gets. The scored design has a disposable worker with nothing worth stealing, no way out, and a narrow, validated return path.

hardNewPreparation tags: Google, Microsoft, AmazonUpdated Nov 2026

Assume the parser will be exploited, then decide what the exploit gets. The scored design has a disposable worker with nothing worth stealing, no way out, and a narrow, validated return path.

Make your first attempt

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 6 follow-ups like an interviewer would

A service must parse user-uploaded documents in a complex format, and the parsing library has had several memory safety advisories.

  1. What should the design assume?
  2. Where should each parse run?
  3. What should the worker have access to?
  4. Which kernel controls help?
  5. How do you handle the output?
  6. How would you confine the parser?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
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