Do you know how to put a rap on the Notorious BQE? The city’s got a job for you. The Big Apple is looking to hire a $250-a-year “creative” engineer who can finally save the crumbling stretch of expressway that has three tiers pretzeled together along the Brooklyn waterfront. The Department of Transportation last week quietly posted a job listing for the BQE Central Assistant Commissioner — a gig that would solely focus on the 1.5-mile expanse of the highway that contains an infamous disintegrating “triple cantilever.” The triple cantilever of the BQE has been threatening to crumble for decades. Getty Images “Be a part of addressing the condition of the BQE Central section (aka triple cantilever) once and for all. This is an urgent infrastructure priority project, and leading that effort is