Case Study

CongoCart – E-commerce Backend

Backend APIs powering cart, checkout, and order workflows with security, scalability, and clean architecture.

.NET 8 ASP.NET Core Clean Architecture PostgreSQL JWT Authentication

Problem

E-commerce platforms require a reliable backend to manage carts, checkout flows, and order processing while handling concurrent user activity and ensuring data integrity.

The challenge was to design APIs that remain secure, predictable, and scalable under real-world usage without tightly coupling business logic to infrastructure.

My Role & Responsibilities

• Designed RESTful APIs for cart, checkout, and order management
• Implemented JWT-based authentication and role-based authorization
• Structured the backend using Clean Architecture principles
• Handled validation, error handling, and API consistency

Architecture & Design Decisions

I implemented Clean Architecture to ensure clear separation between business rules and infrastructure. This approach improves testability, maintainability, and long-term scalability.

• API Layer: Request handling, validation, routing
• Application Layer: Use-case logic and workflows
• Domain Layer: Core entities and business rules
• Infrastructure: Database access and authentication

Security Considerations

• JWT authentication for stateless and secure API access
• Authorization checks on sensitive cart and order endpoints
• Input validation to prevent invalid or malicious payloads
• Centralized exception handling to avoid information leaks

Performance & Reliability

• Optimized database queries for cart and order operations
• Stateless API design enabling horizontal scaling
• Clear separation of read and write responsibilities

Future Improvements

• Introduce Redis caching for cart and product data
• Add background workers for order processing
• Implement structured logging and monitoring
• Add rate limiting and request throttling

CongoCart demonstrates my approach to building secure, maintainable, and production-ready e-commerce backends.