Can you tell about the most significant tasks and solutions you implemented in your last project?

In my last project, I was involved in developing an order management system in Java. One of the key tasks was ensuring reliable transaction processing and integration with external payment services.

To address this, I used the Spring Framework with transaction support via @Transactional, which helped guarantee data integrity in case of failures. I also implemented a REST API for interaction with the frontend and external services.

Example code using the @Transactional annotation:

@Service
public class OrderService {

    @Transactional
    public void processOrder(Order order) {
        // logic to save the order
        orderRepository.save(order);
        // call to external payment service
        paymentService.charge(order);
    }
}

This approach improved the reliability and scalability of the application.