A Bloom filter answers 'have I seen this?' using a few bits per item instead of storing the key, trading a rare false positive for a huge memory win. Here is the build, the sizing math, and where it pays off in dedup and serving.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
A Bloom filter answers 'have I seen this?' using a few bits per item instead of storing the key, trading a rare false positive for a huge memory win. Here is the build, the sizing math, and where it pays off in dedup and serving.
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