System Design Full Course - Build Splitwise Clone | Expense Splitting App | System Design

Welcome to Lecture 31 of the Ultimate Low-Level Design (LLD) Series by Coder Army! Seventh week for #lowleveldesign #systemdesign #8weeksLLdchallenge. We are doing 8 weeks challenge and going to complete the whole course within the duration with quality content on Youtube. Let’s learn LLD like never before and attain advance level mastery on this subject. Ever wondered how apps like *Splitwise* handle splitting expenses, tracking balances, and simplifying debts between friends or groups? In this video, we’ll break down a *complete Low Level Design (LLD)* of a *Splitwise clone, coded step-by-step in **C++/ Java, using real-world design patterns like **Strategy, Observer, Factory, and Singleton*! *What you’ll learn:* - How to design and code Equal, Exact, and Percentage splits - How to track who owes whom with balance sheets - How to use Observer pattern for real-time notifications - How to simplify debts to minimize payments - How to organize classes for scalability & maintainability - How to handle group vs individual expenses - How to extend the design for settlements and user removal This session is perfect for software engineers preparing for *System Design & Low Level Design interviews* or anyone curious about how real expense-sharing apps work under the hood! *Tech used:* C++ / Java (no third-party libraries), OOP, SOLID principles Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f Code and Notes: Github : https://github.com/adityatandon15/LLD Connect with Aditya Tandon Instagram : https://www.instagram.com/adityatandon2 LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 00:00 Introduction 00:48 Functional Requirements 04:00 Happy Flow 07:06 UML Design of Splitwise Clone 53:38 Clean UML Diagram 55:18 Debt Simplification Algorithm 01:04:49 Code for Splitwise Clone #SystemDesign #LowLevelDesign #LLD #AdapterPattern #DesignPatterns #Cplusplus #JavaDevelopers #UMLDiagrams #TechInterviews #SoftwareEngineering #XMLtoJSON #CleanCode #SoftwareArchitecture #ObjectOrientedDesign #CodingWithExamples #CodeBetter #8WeeksLLDChallenge #JSON