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Design a human activity recognition system (from sensors or video).

Detecting walking, driving, or a fall from a sensor stream is windowed time-series classification, typically on a battery-bound device. What matters is windowing, temporal smoothing, and the on-device constraints most candidates overlook. Here is the design.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.

Detecting walking, driving, or a fall from a sensor stream is windowed time-series classification, typically on a battery-bound device. What matters is windowing, temporal smoothing, and the on-device constraints most candidates overlook. Here is the design.

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