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Design an ETA / delivery-time prediction system (ride-share, food delivery, logistics).

ETA is spatiotemporal regression served in real time over conditions that change by the minute. The signal is feature freshness, segment or stage decomposition, and the asymmetric cost of being wrong. Here is the design.

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

ETA is spatiotemporal regression served in real time over conditions that change by the minute. The signal is feature freshness, segment or stage decomposition, and the asymmetric cost of being wrong. Here is the design.

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Next in this trackDesign a 'People You May Know' (friend/connection recommendation) system.Next in this trackDesign a news feed ranking system (social media timeline).Next in this trackDesign a vector database / embedding retrieval service.
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