Note, this is about software development, particularly of the agile variety, focusing on Scrum and XP (and gives one explanation for why I don't hear anything about XP nowadays).

(Me, I tend to do "engine" work (and skate on UI design by having really good intuition there (or whatever you'd describe being able to see and figure out things from the user's viewpoint)) and use OOSE/Rational Process in an agile way.)