Demo case file · Phone screen
Stripe
Backend Engineer
This is a demo case file: a realistic example written from commonly known interview formats, not a real candidate's interview experience.
Questions asked
- Implement a basic rate limiter.
- Explain how you would design an idempotent API endpoint for processing payments.
What to expect
Short and focused — only two questions in thirty minutes. Had to write actual runnable code in a shared editor, not pseudocode. Cared a lot about edge cases: retries, duplicate requests, partial failures.
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