In today's society being gender free or politically correct, the person who serves food in a restaurant is sometimes called a 'server'. The is the classification under 'wait staff'. Some restaurants still refer to servers as waitresses or waiters.
In England, they call a cafeteria a 'caf'. This is the informal slang expression, but widely used. They also may call it a cafeteria or a cafe, pronounced 'kaffay'.
In America, a cafeteria is called a cafeteria or a cafe. The traditional cafes are disappearing, but cafeteria-style restaurants are still around, especially in the Midwest and south. They are still often found in colleges, hospitals, or large companies, because they require fewer employees than other restaurants.
Food Service Worker
Lunch people
A Barista.
cafeterian
computer shop attendant/keeper
someone who works for a business
An employee
A gardener.
demonologist
a horticulturalist
collector
Mason
coach
A person who works with gold is called a goldsmith.
Chemist
An Optician x