I realize that it can be hard to understand without having experienced interview anxiety yourself, but it is an entirely different environment.

I suffer from interview anxiety to the same extent as the author of this blog post. Though I am a very skilled developer, I completely freeze in these situations (I even failed a fizz buzz test once). This doesn't translate to difficulty with on-the-job stressful situations however, as my anxiety is only present in interviews.

Most of the anxiety stems from me running through negative thoughts in my head ("I'd REALLY like this job - I'd better not screw up.", "I did poorly on my last interview. I'll probably do poorly this time", "The interviewer can probably see that I'm anxious.", "Does my voice sound shaky?", etc.) to the point where they trigger a fight-or-flight response.