Can you tell about the most significant professional task you completed in the last year?

One of the most significant tasks in the past year was developing and optimizing the order processing system in an online store using Java. I needed to integrate external payment services and ensure reliable transaction processing. During the process, I used Spring Boot to create REST API, Hibernate for database interaction, and implemented asynchronous processing with CompletableFuture, which significantly increased the system's performance and resilience to load.