When I'm the only developer talking to managers, directors, etc. I'm constantly being judged by whether I have good ideas and whether I can be trusted to architect a solution.

May be I am a little overconfident, but I always go into an interview and treat it as a formality to getting the job. By the time I'm in front of the whiteboard, I've already spoken to the recruiter and know what they are looking for, seen the job req to know what technologies they care about, and I've had a phone screen. Why wouldn't I be confident?