System Design Practice Questions
An interactive practice tool for system design questions: you work through a real-world design step by step on a whiteboard and receive AI-powered feedback on your answer. Your practice sessions are saved with their status, so you can return to them and review results. It fills the gap most preparation leaves open, which is actually producing designs under realistic conditions rather than only reading worked answers.
Platform
System Design
Design Gurus
Ongoing
Intermediate
Free
What the tool does
The practice page describes itself as a place to practise real-world system design questions step by step on a whiteboard with AI-powered feedback, built to feel like a real interview. Once signed in, you:
- start a new practice session and pick a problem
- work through the design step by step on the whiteboard
- receive feedback on your design
- see your sessions listed with their problem, start date and status (in progress or completed), and open results later
The gap it fills
Most system design preparation is passive. People read a dozen worked designs, feel prepared, and then discover in the interview that following an argument and constructing one are different abilities. Producing a design yourself, and getting feedback on it, is the part that builds the skill being tested.
How to use it well
- Time-box each session. Aim for about 45 minutes, the length of a typical design round.
- Pick problems you have not read the solution to. The value comes from reasoning without a model answer in your head.
- Work in the order an interviewer expects: clarify requirements, estimate scale, define the API and data model, draw the high-level design, then go deep on one or two components and discuss bottlenecks.
- Talk out loud as you draw, even alone. Explaining is half of what is scored.
- Read the feedback, then redo the weakest part a few days later.
- Do several sessions before a real interview. After four or five, most people find the opening minutes are always similar, which makes the round far less stressful.
Where it fits in preparation
Use it in the final phase of preparation, once you know the building blocks and have studied a set of worked designs. System Design Fundamentals and Grokking the System Design Interview provide the knowledge; this tool is where you rehearse applying it. The Learn System Design roadmap describes this as phase three: practising by designing real systems.
Common questions
Do I need an account? Yes. Practice sessions are tied to your signed-in account so they can be saved and reviewed.
Is it a replacement for a course? No. It is for practice once you have the fundamentals; the courses teach the concepts.
How is the feedback generated? The page describes it as AI-powered feedback on your design.
Best for: engineers in the final weeks before a design round who want to practise producing designs and get feedback.
Ready to start?
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Stuck on something specific?
Writing only gets you so far. If you want an answer to your situation rather than the general case, book a session and we will work through it together. Sessions are free for approved Sefism members, and a few slots open each week.
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