System Design Practice
RADIO practice on 20 questions with AI coach and review. Mock interviews on select questions when enabled.
RADIO practice · 20 questions
You design — AI coaches and scores
Step-by-step RADIO workspace, shared canvas, per-step notes, AI coach, and calibrated review. Free tier: 2 questions and 2 scored submissions. Premium unlocks all questions and unlimited submits.
- The practice coach asks questions — it will not spoil requirements, diagrams, or tradeoffs.
- Every submit is scored against the same calibrated rubric for that question.
- RADIO steps, canvas, notes, and session history in one workspace — not scattered chat threads.
ChatGPT is great for brainstorming; CrackIt Dev is for interview-shaped practice.
Your practice history
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Your progress
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Prep tracks
Pick a track to filter and order questions for your target role — Startup FE for product apps, Platform FE for components and complex systems, or Full loop for all 20 in recommended order.
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