A couple of days ago, John Cook and Aycan Gulez tweeted an article called "How to recognise a good programmer." I became really focused on item #4: "Hidden experience" in the article. The author makes the statement "I strongly believe that most good programmers will have a hidden iceberg or two like this that doesn’t appear on their CV or profile. Something they think isn’t really relevant, because it’s not 'proper experience', but which actually represents an awesome accomplishment."
We as programmers and job seekers do a bad job making employers aware of hidden experience. Even though I was trained as an inorganic chemist, I minored in math, specifically, numerical analysis. I never mentioned this experience on my resume. It was so long ago I had forgotten I had minored in math, much less that I remembered any of the numerical techniques. I was looking at an internal project that was 'stuck' using an Excel spreadsheet, and just happened to recognize the mathematical problem looked a lot like an over determined system. I was able to apply some already developed (and ancient) code to the problem and obtain a solution in a couple of minutes. This, I believe, is what the author is referring too when he mentions icebergs of hidden experience.
It might be worth revisiting your hidden experience in your CV or resume. The experience may be worth more than you think.