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✅ Master Level
LLD (Low Level Design)
Complete Beginner → Advanced Syllabus (Pin-to-Pin)
🟢 LEVEL 1 — Foundations
1. Introduction to LLD
- What is Low Level Design
- Purpose: detailed implementation guide
- Transition from HLD to code
- Stakeholders: developers, tech leads
- Granularity & detail level
2. LLD Scope & Boundaries
- Class design
- Method signatures
- Data structures
- Algorithm selection
- Edge case handling
🟢 LEVEL 2 — Object-Oriented Design
3. Class Design
- Class responsibilities
- Attributes & methods
- Encapsulation principles
- Inheritance vs composition
4. Relationships & Dependencies
- Association types
- Composition patterns
- Aggregation
- Dependency inversion
🟡 LEVEL 3 — Design Patterns Application
5. Creational Patterns
- Factory pattern
- Singleton pattern
- Builder pattern
- Prototype pattern
6. Behavioral & Structural Patterns
- Observer pattern
- Strategy pattern
- Adapter pattern
- Facade pattern
- Decorator pattern
🟡 LEVEL 4 — Database Design
7. Schema Design
- Table structure
- Column definitions
- Primary keys
- Foreign keys
- Constraints
8. Data Relationships
- One-to-one relationships
- One-to-many relationships
- Many-to-many relationships
- Denormalization decisions
- Indexing strategy
🟠 LEVEL 5 — Algorithm & Data Structures
9. Algorithm Selection
- Sorting algorithms
- Searching algorithms
- Graph algorithms
- Dynamic programming applicability
10. Data Structure Selection
- Arrays vs linked lists
- Hash tables vs trees
- Stack vs queue
- Graph representations
- Performance implications
🟠 LEVEL 6 — Method Design
11. Function Signatures
- Parameter design
- Return types
- Error handling approach
- Documentation
12. Implementation Details
- Algorithm pseudocode
- Edge case handling
- Input validation
- Performance optimization
🔵 LEVEL 7 — Error Handling & Validation
13. Exception Handling
- Custom exceptions
- Exception hierarchy
- Try-catch patterns
- Error logging
14. Input Validation
- Type checking
- Range validation
- Format validation
- Null handling
🔴 LEVEL 8 — Performance & Optimization
15. Performance Considerations
- Time complexity analysis
- Space complexity analysis
- Critical path identification
- Optimization opportunities
16. Caching & Memoization
- Cache strategy
- Memoization patterns
- Cache invalidation
🔴 LEVEL 9 — Documentation & Review
17. LLD Documentation
- Class diagrams
- Sequence diagrams
- Code comments
- Design decisions rationale
18. Code Readiness
- Design review checklist
- Testability assessment
- Code quality standards
- Ready for implementation
⭐ Senior Frontend Focus (Must Master)
- React component structure & hierarchy
- Hook design & composition patterns
- State management layer design
- Custom hook interfaces
- Service layer abstraction
- Error boundary patterns
- Performance optimization in components