Grokking the System Design Interview, Volume II
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Code Judging System: High-Level Architecture

Step 4: High-Level Architecture

The system will adopt a distributed, modular architecture with clear separation of concerns. At a high level, it consists of the following major components:

1. Client Interface (Presentation Layer): The user interface (web browser or mobile app) provides problem listings, problem detail pages with an editor, and views for results and leaderboards. When a user writes code and hits “Run” or “Submit,” the client will send an HTTP request (or WebSocket message) to the backend. For example, a POST request to submit code for a problem

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