anyone ever write a fantasy story about the guy that sets traps in the dungeon?

I always thought this would be a cool concept - a short story about the guy that sets all of those nifty boobytraps in dungeons. Maybe he also places the treasure chests there and rigs them up and stuff.

Not quite what you were looking for, but the webcomic Dungeons & Denizens explores dungeon life from the monsters’ point of view.

It’s been done. There was an article in Dragon magazine way back framed as an interview with a trap-setter.

'twas also the concept for a pair of very enjoyable PC games - Dungeon Keeper