A low-level design implementation of a scalable payment gateway system built to explore backend architecture principles, payment processing workflows, extensible system design, and maintainable object-oriented software development.
This project focuses on designing modular and reusable components commonly used in real-world payment and transaction systems.
- Payment processing workflows
- Transaction management
- Multiple payment method support
- Extensible gateway architecture
- Object-oriented system design
- Modular class structure
- Scalable backend design concepts
- Error handling and validation flows
The system was designed with focus on:
- scalability
- maintainability
- extensibility
- separation of concerns
- reusable software architecture
- clean object-oriented design
- SOLID Principles
- Design Patterns
- Payment workflow abstractions
- Transaction lifecycle handling
- Service-oriented thinking
- Low-Level Design (LLD)
- Retry mechanisms
- Idempotency handling
- Distributed transaction support
- Payment status reconciliation
- Notification systems
- Async queue processing
- Fraud detection workflows
- C++
- Object-Oriented Programming
- Low-Level Design
- Design Patterns
- UML diagrams
- Multi-threaded transaction handling
- Database persistence layer
- REST API integration
- Microservice-oriented architecture