Can you explain the architecture you used, which tools you employed, and where you implemented the logic?

In our project, we adopted a microservices architecture to isolate business domains. We used Docker to containerize services, Kubernetes for orchestration, and Spring Boot for the Java services. The logic for user authentication was implemented in the Auth service, while business rules for transaction processing lived in the Transaction service. We leveraged a shared library for common DTOs and validation logic. The services communicate via REST and gRPC, with a message broker (Kafka) for asynchronous events. This separation allows independent scaling and easier maintenance. The architecture also includes a centralized API gateway (Kong) for routing, rate limiting, and security. The logic implementation follows SOLID principles, using dependency injection and repository patterns. This design ensures high cohesion, low coupling, and facilitates continuous delivery.