Matching Blood Donors by GPS: The Geospatial Query Design Behind GeoBlood

Programming Tech Brief By HackerNoon · Sep 1, 2026 · 21m

This story was originally published on HackerNoon at: https://hackernoon.com/matching-blood-donors-by-gps-the-geospatial-query-design-behind-geoblood.

How GeoBlood matches blood donors in real time: MongoDB 2dsphere indexes, $geoNear vs $geoWithin, staged radius expansion, and donor location privacy.

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