LLD Sheet
Master Low Level Design concepts with our comprehensive practice sheet. Learn object-oriented design, design patterns, and system architecture principles.
LLD Sheet - Master Low Level Design for System Design Interviews
Why LLD Matters
- • Foundation of system design interviews
- • Tests object-oriented programming skills
- • Covers essential design patterns
- • Required for senior engineering roles
- • Practical real-world applications
LLD Topics Covered
- • Design Patterns (Singleton, Factory, Observer)
- • Object-Oriented Design (OOP principles)
- • Data Structures (Custom implementations)
- • Concurrency (Threading, Synchronization)
- • Caching (LRU, LFU, Distributed cache)
- • Messaging (Queue, Pub-Sub systems)
LLD Interview Preparation Strategy
1. Learn Design Patterns
Master Creational, Structural, and Behavioral design patterns with real examples.
2. Practice OOP Design
Design classes, interfaces, and relationships for real-world systems.
3. Focus on Scalability
Consider thread safety, performance, and extensibility in your designs.
Popular LLD Design Problems
System Design
Parking Lot, Library Management, Elevator System, Chat System, File System
Data Structures
HashMap, HashSet, Linked List, Circular Queue, Browser History, LRU Cache
Your Progress
Track your journey through Low Level Design concepts
LLD Sheet Frequently Asked Questions
What is Low Level Design (LLD)?
Low Level Design focuses on the detailed design of individual components and classes within a system. It involves object-oriented design principles, design patterns, and creating robust, maintainable code structures.
How is LLD different from HLD?
HLD focuses on system architecture and high-level components, while LLD deals with detailed class design, interfaces, and implementation specifics. LLD is more about code structure and design patterns.
What design patterns should I know for LLD?
Essential patterns include Singleton, Factory, Observer, Strategy, Decorator, and Builder patterns. Focus on understanding when and how to apply each pattern effectively.
How do I approach an LLD interview question?
Start by identifying core entities and their relationships. Define interfaces and abstract classes, then implement concrete classes. Consider scalability, extensibility, and maintainability.
What programming language should I use for LLD?
Use any object-oriented language you\'re comfortable with (Java, C++, Python, C#). The focus is on design principles rather than language-specific syntax.
Is LLD important for senior roles?
Yes, LLD is crucial for senior engineering positions as it demonstrates your ability to write clean, maintainable code and apply design principles effectively.