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Discover Ludwig"day job" is a correct and common phrase in written English.
You can use it to refer to somebody's regular job as opposed to their hobby or other work they do. For example, "She's a painter in her free time, but her day job is as a cashier."
Dictionary
day job
noun
One's principal job; one's regular means of income.
Exact(60)
Day job: model-actress.
What's your day job?
HORATIO HERNANDEZ, 29 DAY JOB: Interior designer.
Don't Quit Your Day Job!
My day job is recipes.
Experiments became the day job.
And with a day job.
"I like my day job.
"The day job is work.
"Maybe get a day job.
"I've got a day job.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com