System design interview practice
Practice system design interviews aloud.Find the gaps in your architecture.
Draw on a whiteboard while an AI interviewer asks about your design. Explain the requirements, defend your trade-offs, and review what to improve before your next attempt.
Sign in or create an account to practice. Use a desktop or tablet and a microphone. Access depends on your plan or available mock credits.
What you will practice
Clarify the problem
Turn a vague prompt into requirements and constraints.
Draw the architecture
Show the components, connections, and request path.
Defend your decisions
Respond to follow-ups, failures, and changed constraints.
Choose what to improve
Use the debrief to find a gap and rehearse it again.
Practice the design and the conversation
Draw and explain the same design
Sketch components and connections while explaining how a request moves through the system. The interviewer can inspect your labeled board and ask follow-ups about what you drew.
Practice the decisions that change the architecture
Clarify a vague prompt. Choose an approach. Respond when the interviewer changes a constraint or asks what happens during failure. Keep the diagram aligned with the system you are describing.
Review more than a final score
Review your board, a phase-time breakdown, and a reference design alongside design-specific feedback. Identify a decision to practice again.
Feedback across five dimensions
- Requirements and scoping
- High-level design
- Deep dives and technical depth
- Trade-off reasoning
- Communication and collaboration
Choose mid, senior, or staff practice in a 35-, 45-, or 60-minute session. These settings guide the practice; they do not predict an employer’s hiring decision.
Prepare for your next system design round
Run a 45-minute practice interview
Follow a timed rehearsal with an opening example and evidence to review.
Choose from 12 practice questions
Use scoping questions and follow-ups to test your first architecture.
Explain a trade-off clearly
Compare alternatives, name the cost, and explain when you would change your choice.
Questions before you practice
Does the interviewer use my whiteboard?
It can inspect labeled components and connected arrows during the conversation. Label your diagram clearly and explain your assumptions aloud.
Can I use my phone?
The whiteboard practice requires a desktop or tablet. Use a device with enough space to draw and follow the interview.
Does this include coding practice?
This mode focuses on system design, architecture, and spoken reasoning. Use separate preparation for algorithm implementation and code execution.
Will the feedback tell me whether I will pass?
Feedback helps you inspect your practice performance. It is not an employer’s assessment or an offer prediction.
Practice your next system design round
Draw the system, explain your choices, and use the feedback to decide what to rehearse next. System design practice sits alongside preparation for behavioral rounds and project discussions.
