Backend Marketplace – Spring Boot

A production-grade Spring Boot backend application for an e-commerce / marketplace system, built with clean architecture, security, pagination, and best practices.

This project demonstrates how a real-world backend system is designed, secured, and deployed.

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🚀 Key Features

🔐 Authentication & Security

• JWT-based authentication (Stateless)
• Spring Security with custom filters
• Role-based authorization
• Password hashing & encoding
• Secure login / signup / logout APIs

📦 Core Business Modules

• Category management
• Product management
• User & Role management
• Seller & Address handling
• Order & Cart related services

🧠 Backend Best Practices

• DTO pattern for request/response separation
• ModelMapper for clean data mapping
• Global exception handling
• Custom exceptions (ResourceNotFound, APIException, etc.)
• Validation using Hibernate Validator
• Clean controller–service–repository layering

📄 Pagination & Sorting

• Pageable & PageRequest support
• Sorting on multiple fields
• Consistent API response structure
• Default pagination values

🗄️ Database & ORM

• Spring Data JPA & Hibernate
• Entity relationships:
  • One-to-One
  • One-to-Many
  • Many-to-Many
• Lazy & Eager fetching
• Cascade operations
• PostgreSQL / H2 support

🐳 Docker & Deployment

• Dockerized Spring Boot application
• PostgreSQL container integration
• Environment-based configuration
• AWS Elastic Beanstalk deployment
• Amazon RDS integration

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🏗️ Tech Stack

• Backend: Java 21, Spring Boot
• Security: Spring Security, JWT
• Database: PostgreSQL, H2
• ORM: Spring Data JPA, Hibernate
• Build Tool: Maven
• Tools: Postman, IntelliJ IDEA
• Containerization: Docker
• Cloud: AWS (RDS, Elastic Beanstalk)

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📁 Project Structure

sb-ecom/ ├── controller ├── service ├── repository ├── entity ├── dto ├── security ├── exception ├── config └── util

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🔄 API Capabilities

• RESTful APIs following HTTP standards
• Proper status codes & response entities
• JSON-based request/response
• Secure endpoints with JWT
• Pagination & filtering support

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🌱 What This Project Demonstrates

✔ Strong understanding of backend fundamentals
✔ Real-world Spring Boot architecture
✔ Secure API design
✔ Database modeling & relationships
✔ Scalable & maintainable codebase
✔ Production-ready mindset

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📌 Future Enhancements

• Split into microservices architecture
• API Gateway integration
• Service discovery & fault tolerance
• CI/CD pipeline

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👤 Author

Nihal Singh
Backend Developer | Java | Spring Boot | Microservices

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💡 This project is part of my backend engineering journey and reflects industry-level development practices.