User blog comment:TheSonofNeptune/The Seven's Hypothetical Futures/@comment-4727448-20131120043001/@comment-23805352-20131121030950

Yeah, but Annabeth has always been interested in the aesthetic part of a building rather than just the structural. Seeing that she's so knowledgeable about historical and ancient buildings, she's probably into art and architecture history as well. She's has more leanings towards the artistic side of building design -- space-making, form and facade, application of art principles like hierarchy, proportion, rhythm, etc  -- hence, architect.

Besides, Leo would have totally been the engineer. In the Demigod Files, there was a comparison between Annabeth with Beckendorf (another child of Hephaetus) in terms of their intelligence -- Athena is more about ideas, concept, philosophy; and Hephaetus is more about figuring out how things actually work. Just like an architect (concept) and engineer (making things work). Of course, then there's Daedalus, who is a child of Athena but is both an architect and engineer... but that's another case altogether. The thing is, Annabeth herself admits that she's more about ideas and less about mechanics, which fits with the whole architecture profession.