The phrase "as a waiter in a" is correct and usable in written English.
It can be used when describing someone's job or role in a specific context, particularly in relation to the hospitality industry.
Example: "She gained valuable experience as a waiter in a busy restaurant during her college years."
Alternatives: "working as a waiter in a" or "employed as a waiter in a".
At one point I worked as a waiter in a German restaurant".
"My first job after graduation was as a waiter in a Times Square steak house.
The two met when Mr. Boehlert was working his way through college as a waiter in a Utica restaurant.
He was working as a waiter in a restaurant owned by a retired policeman — Octopus Ink, the place was called — ideal for someone who wanted to lie low.
Assuming the photographer's identity, Joey dresses in his fancy clothes, cleans up his act and takes a job as a waiter in a Chinese restaurant.
To finance his own education, at several colleges, Mr. Dumpson worked summers as a waiter in a hotel in Cape May, N.J.
Between 1996 and 2001 Kovtun lived in Germany, and worked as a waiter in an Italian restaurant in Hamburg.
All of which made Mr. Psilakis's decision to work as a waiter in an Italian restaurant on Long Island, after graduating from Pace University in 1991, utterly incomprehensible to his parents.
Arriving in New York, Ramu discovers that those letters were lies and finds himself sharing cramped quarters in Queens with several other young men and working as a waiter in an Indian restaurant.
The play's other specific value is its effort to break down "the fourth wall," whereby a stage character who is first seen as a waiter in an Austrian inn, leaps across time and space to materialize as a real actor literally seduced into taking himself seriously as Adolf Eichmann.
The first patient treated by Yealland with faradism was Solomon ('Solly') W., a 35-year-old private from the 9th Oxfordshire and Buckinghamshire Light Infantry who had mainly worked as a waiter in an officers' mess in France and was admitted to Queen Square on 14 December 1915.
