Jobs

cosa fai nella vita? - what do you do? (familiar)
di cosa si occupa - what do you do? (polite)
che lavoro fai? - what do you do? (literally: what job do you have?) (familiar)
che lavoro fa? - what do you do? (literally: what job do you have?) (polite)

io sono ... - I'm ...
   un insegnante - a teacher (for a man)
   un'insegnante - a teacher (for a woman)
   un uomo d'affari - a businessman
   una donna d'affari - a businesswoman
   uno studente - a (university or secondary school) student (for a man)
   uno studentessa - a (university or secondary school) student (for a woman)
   un avvocato - a lawyer
   un dottore - a doctor (for a man)
   una dottoressa - a doctor (for a woman)
   un veterinario - a vet (for a man)
   una veterinaria - a vet (for a woman)
   un architetto - an architect
   un infermiere - a nurse (for a man)
   un'infermiera - a nurse (for a woman)
   un dentista - a dentist
   una dentista - a dentist (for a woman)
   un ingegnere - an engineer
   un contabile - an accountant (for a man)
   una contabile - an accountant (for a woman)
   un soldato - a soldier
   un poliziotto - a policeman
   una poliziotta - a policewoman
   un ballerino - a dancer (for a man)
   una ballerina - a dancer (for a woman)
   un uomo politico - a politician (for a man)
   un politico - a politician (for a woman)
   un poeta - a poet (for a man)
   una poetessa - a poet (for a woman)
   un cuoco - a cook (for a man)
   una cuoca - a cook (for a woman)
   un attore - an actor
   un'attrice - an actress
   uno scrittore - a writer (for a man)
   una scrittrice - a writer (for a woman)
   un giornalista - a journalist (for a man)
   una giornalista - a journalist (for a woman)
   un musicista - a musician (for a man)
   una musicista - a musician (for a woman)
   un mecanico - a mechanic
   uno scienziato - a scientist (for a man)
   una scienziata - a scientist (for a woman)
   un giardiniere - a gardener
   un farmacista - a pharmacist (for a man)
   una farmacista - a pharmacist (for a woman)
   un tassista - a taxi driver (for a man)
   una tassista - a taxi driver (for a woman)
   un impiegato - an office worker (for a man)
   un'impiegata - an office worker (for a woman)
   un commesso - a shop assistant (for a man)
   una commessa - a shop assistant (for a woman)
   un parrucchiere - a hairdresser (for a man)
   una parrucchiera - a hairdresser (for a woman)
   un cameriere - a waiter (for a man)
   una cameriera - a waitress (for a woman)
   un uomo delle pulizie - a cleaner (for a man)
   una donna delle pulizie - a cleaner (for a woman)
   un programmatore - a programmer
   un operaio - a worker (eg in a factory or big industry)
   un muratore - a builder