Topics

Learning Paths

Vote for New Content

Contact support

Topics

Learning Paths

Vote for New Content

Contact support

Home/Low Level Design

Low Level Design

122 articles covering low level design concepts, patterns, and interview questions.

OOP Concepts

Classes and objects: the building blocks of OOP Encapsulation: hiding state and protecting invariants Enums: type-safe constants with behavior Inheritance: IS-A relationships and when to avoid them Interfaces: contracts that define capability Polymorphism: one interface, many behaviors

Design Patterns

SOLID principles Comparison of Patterns Factory method pattern Abstract factory pattern Builder pattern Singleton pattern

Real-world LLD

Design a Chess Game Design a Library Management System Design a Bank Account System Design a Vending Machine Design an ATM System Design a Hotel Booking System

Interview Framework

How to approach OOD interviews How to approach machine coding interviews How to identify entities and model relationships How to write clean code in LLD interviews How to choose design patterns in interviews How to handle concurrency scenarios in LLD interviews

Anti-patterns

God class anti-pattern Anemic domain model anti-pattern Singleton overuse anti-pattern Primitive obsession anti-pattern Magic numbers anti-pattern Feature envy anti-pattern