Bridge Pattern | Real-world use case + Code | System Design

Welcome to Lecture 25 of the Ultimate Low-Level Design (LLD) Series by Coder Army!

fifth week for #lowleveldesign #systemdesign #8weeksLLdchallenge.

In today’s System Design LLD session, we’ll explore the *Bridge Design Pattern, a structural pattern that decouples an abstraction from its implementation so they can evolve independently. Using a **Car ↔ Engine* example in C++:

1. *UML Diagram Walkthrough* – See how the Car abstraction hierarchy (Sedan, SUV) is bridged to the Engine implementor hierarchy (Petrol, Diesel, Electric).
2. *Code Walkthrough* – We’ll step through the C++ implementation, injecting different Engine implementations into Car subclasses for flexible runtime behavior.
3. *When & Why to Use Bridge* – Learn real-world scenarios where Bridge prevents explosion of subclasses and promotes scalable LLD.
4. *Best Practices* – Tips on maintaining clear Abstraction vs. Implementation hierarchies, and keeping your codebase open for extension, closed for modification.

Whether you’re preparing for design interviews or building maintainable architectures, this video will equip you with the knowledge to apply Bridge Pattern confidently.


Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f
Code and Notes: Github : https://github.com/adityatandon15/LLD

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00:00 Introduction
00:59 What Problem Bridge Pattern Solve
04:53 How Bridge Solves that Problem
07:54 UML for Car Example
13:08 Standard UML
16:15 Standard Definition
16:55 Code for car Example
20:30 Difference between Bridge and Strategy
27:07 Real world use case


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