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I have a probably unusual habit: I'm applying for jobs as programmer at least once a year. It 's not that I don't have a job, or that I don't like what I do, but since I am self employed and running my own company I have the feeling that I am coming out of touch of what the current job market is like, and so I started to apply for jobs at different companies once in a while. Just to keep in mind how this is like and for the fun of it.
I think this is also a good training should I need to be employed again in the near future: As 'CEO' of your own company, you tend to become a bit arrogant and tend to get an exaggerated opinion of yourself. Doing job interviews helps you to keep down to reality a bit....