If you know doors and hardware inside and out, this is steady, year-round work with a national subcontractor - no travel, no chasing jobs from site to site, just consistent hours in the shop and real room to grow. You'll hang hollow-metal doors in their frames, install hinges, closers, locksets, exit devices, and related hardware, and adjust each unit until it swings, latches, and seals the way the specs call for.