System design interview question
"Design a system that ingests telemetry from millions of IoT sensors — industrial equipment, vehicles, environmental monitors. Devices are on flaky cellular links, have very little memory and battery, and go offline for hours. Millions of readings arrive per second at peak."
ingestion at the edge of constrained hardware. Unlike a web backend, the client cannot be assumed cooperative, well-connected, or capable of complex retry logic. The interesting problems are protocol choice, backpressure when devices outnumber capacity, and clock skew on devices with no reliable time source.
On Practick another engineer interviews you live for 60 minutes on a question from this bank. They have the full interviewer guide beside the call: the answers to your clarifying questions, the numbers to hand out, a ladder of follow-ups and a scoring rubric. You get the model solution once the session settles. It is free: interview someone for an hour and you have earned your own.
Book a free mock interviewAll 132 system design interview questions
System design mock interviews · DSA interview questions · Free mock interview practice · Browse interviewers · Sign in