In medical terms, a person who works with feet is a podiatrist. Of course, your question as phrased could also be about Ballet dancers. They work with their feet. There is also a martial art based on kick boxing.
Too be honest im a person that likes to do this and I know it from the back of my hand so here is the answer: Podiatrist
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
A co-worker. or colleague