System Design
Bridging the gap between a problem and a functional, scalable solution. Mastering both Low-Level and High-Level Design is essential for senior roles and complex project interviews.
Low-Level Design (LLD)
LLD focuses on the 'how' at a component level. It's about designing individual classes, their methods, and their relationships. Think of it as creating a detailed blueprint for a single part of the system. In interviews, LLD questions test your object-oriented design skills, understanding of design patterns, and ability to write clean, maintainable code.
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High-Level Design (HLD)
HLD is the bird's-eye view of the system. It's about defining the overall architecture, services, databases, and how they interact. Think of it as the master plan for the entire project. HLD interview questions evaluate your ability to design scalable, reliable, and available systems. You'll discuss trade-offs, database choices, caching strategies, and communication protocols.