Do -not- say something like "I would have declined the offer as the position would have been maintenance oriented since the bulk of the work was satisfactorily completed."
The vast majority of software work is in maintenance work, having to deal with other people's code and bugs. It's just a fact of life, and any manager is going to nix someone who tries to avoid that reality.
You can say something like "I prefer building new apps over maintenance" and that'd be fine; everyone would just nod and agree. But you certainly cannot appear as one of those obnoxious types who refused to deal with other folk's work and habits.
FORTRAN is not a flower but a weed -- it is hardy, occasionally blooms, and grows in every computer. -- A.J. Perlis