What are construction worker positions?

According to TheBalance.com, the construction industry employed more than 6.5 million workers in May 2017. Roles in this field include general construction laborers, as well as highly skilled artisans like carpenters. Construction companies have hierarchical positions with construction managers, supervisors, and coordinators at the top, and construction laborers and assistants at the bottom. Many general contractors also hire subcontractors to complete work at job sites, including electricians, insulation workers, drywall installers, ironworkers and masonry workers, roofers, machine operators, and engineers.