System Design & LLD Interview Mastery Notes

📚 What You’ll Learn

🔹 Low-Level Design (LLD)

• SOLID Principle
• Design Patterns with code example
• Frequently asked LLD interview questions (code + UML + design pattern used)

🔹 Core System Design Concepts

• Transactions & Consistency (ACID, eventual consistency)
• CAP Theorem (with real-world understanding)
• Handling Race Conditions
• Dual Writes problem & solutions

🔹 Advanced Architecture Patterns

• Saga Pattern (distributed transaction handling)
• CQRS (Command Query Responsibility Segregation)
• Designing fault-tolerant systems
• Scaling distributed systems effectively

🔹 Real-World Backend Tools

• Redis (caching strategies & use cases)
• Kafka (event-driven systems basics)
• Database Scaling (read replicas, sharding concepts)