Oh, something with computers!
Some people are exactly where they belong. And then there are people like Jan who up it a notch. Jan is bliss on computers. He likes to build and debug technical things and the louder he swears, means the more fun he is having developing. Jan likes simple and maintainable solutions and dutifully points out if something is over-engineered or too complex. He loves discussing the theory of technical problems, but also getting the “high” when a tricky task is finally solved in practice.
Even in his spare time he fixes, and builds features as open source contributions. Basically, there are only three things that can lure Jan away from a computer and those are his children, whom he loves more than anything. Watching them grow up is better for him than any Terry Pratchett novel.