WeSplit - Expense Sharing Web App

WeSplit is a full-stack expense sharing application inspired by Splitwise. Designed to make managing shared expenses, group balances, and settlements easier, it's ideal for roommates, travel groups, or anyone who splits costs regularly.

-Frontend repository: https://github.com/Shaurya-GitH/WeSplit-Frontend

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🔑 Features

User Authentication

• Secure user registration and login using Spring Security and JWT tokens.

Expense Tracking

• Add expenses, assign participants, and split amounts evenly or unevenly.

Group Management

• Create and manage groups to organize shared expenses among multiple users.
• Cash flow minimization algorithm
• Automatically settle expenses through payments or creating expenses

Balance Calculation

• Real-time tracking of who owes whom and how much.
• External API integration for automatic currency conversion while settling balances

Robust REST API

• Clean and modular APIs built with Spring Boot and validated thoroughly.
• Follows RESTful principles with DTO projections and proper layering.

MySQL + Hibernate/JPA

• Efficient relational data handling with eager loading, DTO projections, and prevention of N+1 query issues.

Caching using Redis

• Used NoSQL database Redis for caching of data which require heavy SQL queries and accessed frequently reducing time to as low as 10ms
• API rate limiting using Redis

API Documentation

• Integrated Swagger UI for easy visualization and testing of endpoints.

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🛣️ Planned Features

• Activity Feed using Kafka
• Notification System for expenses & settlements using websockets
• Test Coverage using JUnit & Mockito

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💻 Tech Stack

• Backend: Java, Spring Boot, Spring Security, Spring Data JPA, MySQL, Redis
• Tools: Swagger, Postman, IntelliJ IDEA, Maven
• Version Control: Git, GitHub

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