Code review checklist for LLD - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Key focus areas in a Low-Level Design (LLD) code review

Which of the following is NOT typically a focus area during a code review of Low-Level Design?

A Ensuring proper error handling and logging mechanisms

B Verifying the correctness of database schema design

C Checking if the code follows the defined class and method structure

D Reviewing adherence to naming conventions and code readability

💡 Hint

Think about what LLD focuses on versus higher-level design aspects.

Database schema design is usually part of high-level design or database design, not LLD code review.

❓ Architecture

intermediate

Identifying design pattern usage in LLD during code review

During a code review of LLD, which option best describes how to verify correct use of design patterns?

A Verify that design patterns are implemented as per their standard structure and intent

B Check if the code uses design patterns only if explicitly mentioned in requirements

C Ensure all classes inherit from a single base class regardless of pattern

D Confirm that design patterns are avoided to keep code simple

💡 Hint

Design patterns have specific structures and purposes.

Correct use of design patterns means implementing them according to their standard definitions and intent.

❓ scaling

advanced

Evaluating scalability considerations in LLD code review

Which option best describes a scalability concern to check during LLD code review?

A Verifying that all methods are static to avoid object creation overhead

B Confirming that the code uses synchronous calls exclusively for simplicity

C Ensuring that classes and methods are designed to handle increased load without bottlenecks

D Checking if the code uses global variables extensively for faster access

💡 Hint

Think about how design affects handling more users or data.

Scalability in LLD means designing classes and methods to efficiently handle growth in load.

❓ tradeoff

advanced

Tradeoff analysis in LLD code review

Which tradeoff is important to evaluate during LLD code review?

A Selecting between different font styles for code editors

B Choosing between detailed comments and code brevity

C Deciding whether to use tabs or spaces for indentation

D Balancing between code modularity and performance overhead

💡 Hint

Consider design decisions that affect both maintainability and speed.

Tradeoffs in LLD often involve balancing modularity (easy maintenance) with performance (speed).

❓ component

expert

Determining the correctness of component interactions in LLD

In a code review of LLD, how can you best verify that component interactions are correctly designed?

A Ensure components communicate only through well-defined interfaces or APIs

B Check if components directly access each other's private data fields

C Verify that all components are merged into a single monolithic class

D Confirm that components use global state variables for sharing data

💡 Hint

Good design isolates components and controls their communication.

Correct component interaction means using clear interfaces to avoid tight coupling and maintain encapsulation.