"Software Janitor" is my personal favorite. I should probably carry around a bag of pencil shavings on principle.
Software mechanic says: I don't mind getting my hands dirty while doing intricate work (computers, who understands 'em?). Janitorial work seems to be regarded as lowly drudge work, even though being a good caretaker/warden means preventing problems from occurring in the first place, like watering the garden and keeping leaks in check.
Everyone is trying to keep a cupboard in order somewhere :).