John's response indicates he is familiar with using various diagnostic tools such as crash analytics, user flow analysis, and API monitoring to troubleshoot issues in production. He mentions specific tools like Google Play Console, Amplitude, and Dynatrace, which shows applied experience. However, his response could be improved by outlining a more structured approach to diagnosing and resolving issues, as demonstrated in the benchmark response. Additionally, he could mention the importance of replicating the issue in a controlled environment, testing fixes, and monitoring post-deployment to ensure the issue is resolved.