Kirstin Harper-Smith is helping build downtown Los Angeles

The gig: Kirstin Harper-Smith, 32, is senior project manager at Boston-based Suffolk Construction, where she is supervising the building of a 525-unit apartment tower on Hope Street in downtown Los Angeles. The 888 Grand Hope Lofts project by L.A. developer CIM Group will eventually rise 34 stories, consuming 27,000 cubic yards of concrete and 3,500 tons of rebar along the way. As head of the 10-person office side of the project, she oversees the budget, ensures safety requirements are met and directs who should do what jobs when -- all while trying to keep the project on schedule to wrap in about two years. She anticipates 10-hour days until then. An early start: Harper-Smith caught the engineering bug while growing up in San Diego.