#iot

5 iot interview questions, asked at Amazon, Microsoft, OpenAI and 2 more companies. Last asked Sep 2026.

Design a Supercharger backend: billing, stall telemetry and finding a free chargerSystem designDesign the backend for a network of EV fast-charging sites, each with several stalls. Three requirements: 1. Billing: measure the energy delivered in every charging session and…
Last asked Sep 2026
Design an offline-first IoT log collection platformSystem designMillions of devices that are often offline write success and failure logs locally and upload them in batches when they reconnect. Operators can also ask a set of devices to start…
Last asked Sep 2026
Design reliable command delivery between autonomous vehicles and the cloudSystem designDesign how commands are sent between the cloud and a fleet of autonomous vehicles (and acknowledgements back), so a command is delivered and acted on exactly as intended even with…
Last asked Aug 2026
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Design Amazon LockerSystem designLet customers pick a locker location at checkout, assign a compartment that fits the package, and give them a code to collect it within a few days.
Last asked Jul 2026
Design a real-time temperature monitoring systemSystem designCollect readings from millions of sensors every few seconds, show live and historical temperatures, and alert when a sensor goes out of range or silent.
Last asked Jan 2026