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You're given a small repo with failing tests and a vague bug report: fix the bugs, then add a feature

The format that filters out LeetCode-only candidates: unfamiliar code, failing tests, 45 minutes. There's a repeatable protocol for it, and a reason the first five minutes decide the round.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The format that filters out LeetCode-only candidates: unfamiliar code, failing tests, 45 minutes. There's a repeatable protocol for it, and a reason the first five minutes decide the round.

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