I work as a barista,  is a person, usually a coffeehouse employee
Nice, do you work at a Starbucks or a similar coffee shop?
At Starbucks@ The word "barista" is an Italian word, and in Italy, a barista is a male or female "bartender"
It must mean you have a lot of duties at work. What do you do as a barista? 
I have heard that The native plural in English is "baristas", while in Italian the plural is "baristi" for masculine
Ok, and what does a barista do? Just serve coffee? 
Well Baristas generally operate a commercial espresso machine, and their role is preparing and pulling the shot; the degree to which this is automated or done manually varies significantly.
Yea I bet automation helps a lot. What else can you tell me about your job?
Espresso is a notoriously finicky beverage so it requires a experts eye