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Write three chunkers (fixed-size with overlap, recursive separator, semantic) and defend when each wins.

Everyone can recite the chunking tradeoff. Far fewer can write the splitter, keep the offsets a citation needs, and answer the question that kills the fixed splitter: what happens to a fact that straddles a boundary.

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

Everyone can recite the chunking tradeoff. Far fewer can write the splitter, keep the offsets a citation needs, and answer the question that kills the fixed splitter: what happens to a fact that straddles a boundary.

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