System design interview question
"Design Strava. Athletes record runs and rides with GPS, upload the track, and it appears on their feed with distance, pace, and elevation. The signature feature is segments — named stretches of road where every athlete who has ever ridden it is ranked on a leaderboard. 100 million users."
geospatial matching of a recorded path against a library of known paths — a genuinely different geo problem from point-proximity. Segment matching is the crux: given a 2-hour GPS track with 7,000 points, which of 30 million known segments does it contain, and where exactly? Everything else (feed, upload, leaderboards) is standard.
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