hardAnthropic

Implement a multithreaded web crawler with a thread pool, then survive the GIL and asyncio follow-ups

The reported Anthropic concurrency round: the crawler is twenty minutes, the follow-ups are the interview. Why threads work despite the GIL, what asyncio buys you, and where the semaphore goes. The answers, with the race condition graders plant.

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

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