Currently I have a job at PDC. My primary fields are computer security, storage and networking, so somehow most of the interopability problems between different (mostly Unix) systems end up in my lap. There they get taken care of or killed. One could say that's "building computing infrastructure".
People who want to hire my skills outside KTH can do so on consulting basis. The one-man-show is called HABADAT.
Former employments include PI.SE where I built up the ISP infrastructure and Axiom AB maintaining a CAD symbol compiler. PI.SE got bought by France Telecom and Axiom by Mentor Graphics, so I moved on.
I have attended and complete a lot of courses in the computer science program of KTH. When pigz fly and hell freezes over I will actually checkout a degree.