Grokking the System Design Interview, Volume II
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Step 4: High-Level Architecture

A judge does two kinds of work. Accepting a submission is quick and must never fail, while running the code is slow, expensive and dangerous. The design keeps the two in separate services with a queue between them. We follow one contestant, Priya, as she opens the problem "Two Sum", submits a solution, and waits for her verdict.

Path 1: Priya opens the problem

  1. The request enters through the API gateway. Every request passes through a load balancer or API gateway, like Nginx or AWS Elastic Load Balancing

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