[kondu]

Unfortunately, you don't always know if on-call will be involved until you start at the job. Often many companies don't even hire you with a particular role in mind, instead you are matched to a team after you're signed on. (Especially for new grads). And sometimes on-call is introduced in an existing role, it can be difficult to refuse, especially for people in more junior roles.

But definitely ask about on-call when interviewing, in case they say they have it you can bail out before you sign.

[mancerayder]

I ask about it repeatedly to all interviewers to the point that some companies disqualify me. Call it a survivorship bias in reverse. It doesn't always work, amazingly, but it always sends a strong signal.