Low Level Design Practice
Practice for Low Level Design Interviews step-by-step with AI powered evaluation and feedback
How it WorksHow it Works
Knowing SOLID principles and design patterns is one thing. Turning them into a clean class design under interview pressure is another.
Timed and interactive
Each question is a timed, AI-led mock interview where you clarify requirements, identify the core entities, and design the classes and relationships. You can type or speak your answers and submit when you are ready.
Write real code
The final stage includes a full code editor and compiler. You implement your design in the language you choose and submit to get feedback on the design and code quality.
Detailed scoring and feedback
Each stage is scored out of 10 with detailed feedback on what you did well and what you can improve. Every attempt is saved to your history, making it easy to track your progress over time.
What each interview covers
Every mock interview follows the same four stages, in order.
- 1
Requirements
Clarify the functional and non-functional requirements, resolve any ambiguity, and define the scope before starting your design.
- 2
Entities
Identify the core entities in the system and explain what each one represents and is responsible for.
- 3
Class design
Define the classes and interfaces, including their fields, methods, states, and relationships. Explain any design patterns you use and why they fit the problem.
- 4
Implementation
Implement your design in the in-browser code editor and run it to test. Submit code to get detailed feedback.
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 low level 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 choose the duration at the start of the interview, typically between 30 and 60 minutes depending on the question and your experience level.
Do I have to write code?
Yes. The final stage is a code implementation stage with a full editor, so you write and run real code rather than describing it. You can pick the language you are most comfortable with.
How is my answer evaluated?
The AI interviewer evaluates each stage 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.