Tell me about an interesting problem you are proud of

One of the tasks I am proud of is related to optimizing the operation of a distributed data processing system in Java. We faced an issue with high latency when processing large volumes of messages.

I proposed implementing asynchronous processing using CompletableFuture and optimizing the thread pool for more efficient resource utilization. I also implemented caching of frequently requested data using ConcurrentHashMap.

This allowed us to reduce the system's response time by 40%, improve scalability, and increase stability under load.

Example of using CompletableFuture:

CompletableFuture.supplyAsync(() -> fetchData())
    .thenApply(data -> processData(data))
    .thenAccept(result -> System.out.println("Result: " + result));