Could you tell which preposition: in or at it is correct and natural to use in the following sentences?
The thing is, I didn't like the working hours in/at my previous job, which is why I quit.
I have a lot on my plate in/at my job at the moment.
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I would only use at my job in two contexts:
I'm not very good at my job.
He's very clever at his job.
They're methodical at their jobs.
There's somebody at my job who keeps annoying me.
(This use is not very common - more often people say at work or at my office, or at the shop - but you hear it sometimes).
So in both your examples at my job is possible, in the second sense; but in my job is much more likely. In the first case, I'd say that of or for is more likely still.