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Interview question · Systems, OS & Memory Safety

As a staff engineer, how would you reduce memory-safety risk in a large C++ codebase that cannot be rewritten?

'Rewrite it in Rust' is a slogan, not a plan. The staff answer ranks components by exposure, stops new bugs at the boundary first, and keeps the old code contained while the language mix shifts.

expertNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

'Rewrite it in Rust' is a slogan, not a plan. The staff answer ranks components by exposure, stops new bugs at the boundary first, and keeps the old code contained while the language mix shifts.

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 company with millions of lines of C++ wants to reduce memory safety vulnerabilities without stopping product work.

  1. Why not rewrite everything?
  2. How do you rank components?
  3. What should new code use?
  4. What about the existing C++?
  5. How do you measure progress?
  6. What plan would you propose?

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.

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