System Design Interview Practice
Practice for System Design Interviews step-by-step with AI powered evaluation and feedback
How it WorksHow it Works
Understanding system design concepts is one thing. Applying them under interview pressure is another.
Timed and interactive
Each question is a timed, AI-led mock interview where you clarify requirements, work through the design step by step, and explain your decisions. You can type or speak your answers and submit when you are ready.
Scored with feedback
Your performance is evaluated on the quality of your responses and how well your solution meets the requirements. You receive a score and detailed feedback after each attempt.
Practice at your pace
Sessions can last between 45 and 120 minutes. You can retry any question as often as you like, and every attempt is saved in your history.
What each interview covers
Every mock interview follows the same five stages, in order.
- 1
Requirements
Start by separating functional requirements from non-functional requirements and clearly defining the scope of the system.
- 2
Capacity estimation
Estimate expected traffic, storage needs, and bandwidth requirements.
- 3
API design
Define the main APIs and choose the right communication protocol for the system.
- 4
High level design
Identify the major components of the system and explain how requests and data move between them.
- 5
Database design
Choose an appropriate data model and storage technology.
Each stage is scored out of 10 and includes written feedback explaining what you did well, what was missing, and where you can improve. This makes it easy to identify which part of your approach is holding you back.
Frequently asked questions
Are the system design mock interviews free?
A selection of questions is free to practice without a subscription. The rest are included with AlgoMaster premium, along with voice mode for speaking your answers.
How long does one mock interview take?
You can choose the duration at the start of interview between 45 and 120 minutes depending on the question difficutly and your experience level.
How is my answer evaluated?
The AI interviewer evaluates each stage of your design using your submitted answer, the surrounding conversation and our reference solution. Every stage is scored out of 10 and includes detailed feedback, making it easy to see where you performed well and where you lost points.
Can I retake the same question?
Yes. You can attempt the same question multiple times. Every session is saved with its score and feedback, and you can reopen past attempts from your interview history.