Tell about a failure at work.

In working with Go, failures are often related to improper error handling, data races, or goroutine leaks. For example, forgetting to check the error after a function call is a common cause of problems. In one project, I encountered a situation where, due to lack of context control, goroutines did not terminate, leading to memory leaks and performance degradation. The solution is to always use contexts and handle errors correctly, as well as to employ profiling tools and race detectors.

Example of proper error handling:

result, err := someFunc()
if err != nil {
    log.Printf("Error calling someFunc: %v", err)
    return err
}
// continue working with result

This approach helps to avoid many issues and quickly localize the source of the failure.