Build an interactive system design interview arena where users solve realistic engineering challenges such as designing a URL shortener, notification platform, collaborative editor, payment service, or high-traffic content platform. Present requirements progressively and let users choose architecture components, databases, queues, caches, consistency models, and scaling strategies on a visual canvas. Introduce changing constraints, traffic spikes, failures, and new product requirements as the exercise develops. Evaluate decisions using explicit rubrics for correctness, scalability, reliability, security, cost, and trade-offs. Provide hints and coaching based on the learner's choices rather than revealing a complete solution immediately.
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