Microservice architecture, hexagonal design pattern, event-driven architecture, scalable system, distributed database, RESTful API, containerization using Docker, Kubernetes orchestration, cloud-based infrastructure, Azure or AWS deployment, modern web development, modularized code structure, dependency injection, interface segregation principle, factory method pattern, abstraction layer, facade design pattern, layered architecture, high cohesion, low coupling, test-driven development, agile methodologies.