When responding to a question about a difficult bug you encountered, it's important to provide a clear and concise explanation of the situation. Here are some steps you can follow to craft a good answer:
Here's an example answer:
"In a previous role, I was working on a web application that was experiencing intermittent crashes. The crashes were happening randomly and we were having a hard time reproducing the issue. After some investigation, I found that the crashes were happening when the application was under heavy load.
To solve the issue, I first looked at the server logs to see if there were any clues there. I also reviewed the code to see if there were any obvious performance bottlenecks. I then used a performance profiling tool to identify parts of the code that were taking a long time to execute.
After some analysis, I found that there was a memory leak in one of the third-party libraries we were using. This was causing the application to crash when it ran out of memory under heavy load. To fix the issue, I worked with the library vendor to identify and fix the memory leak. We then updated the library in our application and ran load tests to verify that the problem was resolved."