In 2025, backend development teams are leveraging Kotlin to address common anti-patterns and optimize their codebase, as outlined by José Luis González, a JetBrains-certified Kotlin Trainer. Teams often struggle with legacy Java habits, such as overusing inheritance, which can be resolved by adopting Kotlin's data-oriented and expression-based designs. Other prevalent issues include the misuse of ambient singletons and typealias, which can be mitigated by using context parameters and value classes, respectively. Coroutines are frequently misunderstood as mere threads, leading to inefficient code, but can be managed effectively with proper scoping and structured concurrency. For testing asynchronous Kotlin code in CI/CD environments, injecting dispatchers and employing deterministic testing patterns are recommended. When diagnosing unexpected memory usage in Kotlin microservices, González advises examining JVM behavior, limiting thread and buffer usage, and profiling to identify the source of memory consumption. His insights reflect a broader trend toward idiomatic Kotlin practices that enhance performance and maintainability.