Notes / Low Level Design / 01 Object Oriented Design Principles / 1 Solid Principles

1 — SOLID Principles

The five SOLID principles — Single Responsibility through Dependency Inversion — as the baseline design discipline every LLD interview answer gets measured against.

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1 — SOLID Principles

Purpose

[stub: solid-principles]

Planned coverage:

  • Single Responsibility Principle
  • Open Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation Principle
  • Dependency Inversion Principle

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AuthorAmit Singh
Scopelow-level-design

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2 — GRASP Principles

The nine GRASP patterns — Information Expert, Creator, Controller, Low Coupling, High Cohesion, and more — for assigning responsibility to the right class.

3 — OO Design Heuristics

Practical heuristics beyond SOLID and GRASP — favoring composition, programming to interfaces, the Law of Demeter, Tell Don't Ask, and Command Query Separation.

4 — Clean Code

The clean-code habits — naming, small methods, spotting code smells, and refactoring for readability — that keep a well-principled design from decaying in practice.

Low-Level Design for MAANG Interviews

A book-shaped table of contents for LLD interview prep: OOP fundamentals through SOLID, design principles, UML, design patterns, dependency management, reliability, concurrency, domain modeling, API design, testing, refactoring, classic interview problems, advanced architecture, and performance — cross-linking Object-Oriented Programming and Patterns instead of duplicating them.
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