System design interview structure in HLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the first step in a system design interview?

Understanding and clarifying the requirements clearly before starting the design.

beginner

Why is it important to ask clarifying questions during a system design interview?

To ensure you understand the problem scope and constraints, which helps in designing an appropriate solution.

intermediate

What does 'high-level design' mean in the context of system design interviews?

It means outlining the main components and their interactions without going into low-level details.

beginner

Name two common components you might include in a high-level system design diagram.

Clients (users or devices) and servers (application servers, databases).

intermediate

What is the purpose of discussing trade-offs during a system design interview?

To show your understanding of different design choices and their impact on scalability, reliability, and cost.

What should you do immediately after hearing the system design problem?

A Write code

B Start drawing the architecture

C Ask clarifying questions

D Discuss trade-offs

Asking clarifying questions helps you understand the problem fully before designing.

Which of the following is NOT typically part of a high-level design?

A Main system components

B External system interactions

C Data flow between components

D Detailed database schema

Detailed database schema is a low-level detail, not part of high-level design.

Why is scalability important in system design?

A To handle increasing user load smoothly

B To reduce initial development time

C To make the system look complex

D To avoid writing documentation

Scalability ensures the system can grow and handle more users or data without failure.

What is a common first step after clarifying requirements?

A Write test cases

B Define system components

C Deploy the system

D Optimize code

Defining components helps organize the system structure early on.

Which trade-off might you consider in system design?

A Latency vs. consistency

B Color vs. font size

C Number of developers vs. salary

D Keyboard layout vs. mouse type

Latency vs. consistency is a classic trade-off in distributed system design.

Describe the typical structure of a system design interview from start to finish.

Think about the logical steps you take when solving a design problem.

Explain why trade-offs are important in system design interviews and give an example.

Consider how different choices affect system behavior.