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Sharpen your skills with hands-on building. Use the sandbox for free-form design, tackle real interview problems, or run interactive simulations to see your systems under load.
Free-form canvas. Drag and drop components, connect them, and build any system design from scratch.
Guided system design challenges. Get constraints, build your solution, and receive AI-powered feedback.
Design under pressure. Pick a difficulty, race the clock, and get AI feedback when time is up.