🧱What LLD Actually Means

Low Level Design (LLD) is the stage where you decide classes, methods, interfaces, and object relationships for a concrete implementation. High Level Design tells you what major components exist. LLD tells you exactly how those components behave in code.

Key points

• •LLD sits between architecture and coding
• •It focuses on maintainable object models, not infrastructure
• •Good LLD reduces rewrite work when requirements evolve
• •In interviews, clarity beats cleverness

From problem to code

• •Requirements define what the system must do
• •HLD defines services and major boundaries
• •LLD defines class contracts and interactions
• •Code implements those contracts