System design interview question
"Design an online coding judge. Users write code in a browser, submit it, and within a few seconds get a verdict — accepted, wrong answer, time limit exceeded — from running it against test cases. The code is arbitrary and written by strangers, and during a contest ten thousand submissions arrive per minute."
sandboxed execution of untrusted code with precise resource measurement. It shares the untrusted-code problem with a CI platform, but adds two specific requirements: verdicts must be deterministic and fair, since a time limit must mean the same thing for every submission, and contests produce sharp, scheduled load spikes.
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