This visionary person passed information to design engineers who specified the required strength, ductility, hardness, durability and necessary chemical resistance for the raw material. The finished specifications were forwarded the purchasing department where they were used to locate suitable vendors. Vendor product arrived at the factory door where it was tested against specifications. If it passed the test, the raw materials went to production where it was flattened, shaped, painted, and shipped. Low-quality products are sent to the repair facility for rework.
Jobs exist because an organization needs something done.
Unless the organizational objective is to reduce unemployment, people are hired to make decisions, solve problems, process paperwork, take out the garbage, satisfy customers, or organize work. Hopefully, all this takes place efficiently enough for the organization to make more money than it spends. Once the organization recognizes a job needs to be done, managers specify job requirements and pass them to the recruiters. Candidates are interviewed and those who pass are subjected to management directives, training and organizational influences. People who don't produce get sent to training.