Now practice all your interviews before giving the real one
( System design practice )
Read the brief, ask what you need to know, sketch your system, then get a review that says exactly what to fix.
Each question comes with its requirements and numbers. Ask the interviewer anything the brief leaves open.
Lay out services, databases, queues and caches on a canvas made for system diagrams.
A review says what's missing and what to fix next. Fix it and ask again, then finish for a score.
( What you get )
Type a question about scale or scope and get the answer the interviewer would give, instantly.
Boxes, arrows and notes — draw the design the way you would on a whiteboard in the room.
Each round checks your design against the requirements and names the next thing to fix.
Coverage, fit, consequences and stress: does it do the job, is every part earned, and does it survive spikes and failures.
The warm-up and building-block questions are free, so you can learn the pieces before whole systems.
The Practice pass opens every question for ₹199 a month in India, $5 elsewhere. Starter and Pro already include it.
Questions
The warm-up and building-block questions are free with an account. The Practice pass (₹199 a month in India, $5 elsewhere) opens every question, and the Starter and Pro interview plans include it.
Ask for a review whenever you like, up to 5 times on one question. Each review checks your design against the question's requirements and tells you what to fix next. When you finish, you get a score on coverage, fit, consequences and stress.
With the warm-up questions, then the building blocks — caches, queues, databases — before whole systems. Our guide to system design interviews for beginners walks through what the round expects.
Design practice is you and the canvas, at your own pace. A mock interview is a live voice round with an AI interviewer who asks about your CV and can set a design task in the conversation, then scores every answer.
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Ready when you are
The warm-up and building-block questions are free. Sign in and draw your first design.