I am wondering if it’s possible to pause a queued job when the current day is a non-working day (like the weekend) like wait for it being processed until a specific day. Is this possible?
Do I need to write a custom job filter attribute for this? If so, how would this work?
You can have your job do it. If it is not weekday it will queue one for weekday and return otherwise continue processing.
Also have you consider using scheduled jobs?
Use a CRON expression to specify the days of the week.
https://docs.hangfire.io/en/latest/background-methods/performing-recurrent-tasks.html