仕事は楽しいですか？って英語でなんて言うの？

Do you enjoy your job?
Do you like the work that you do?
How do you like your job?
Do you like the career that you've chosen?
What do you like most about your job?
Does your job make you happy?
How's the new job coming? Do you like it?

if you enjoy something then you have a nice or pleasent time doing it
When talking about your job you can also call this 'work' or 'employment'

Asking how things "are going" is a common way to ask a broad question. "How's it going?" is a broad way to ask how one is feeling. So, when you ask how things are going at work, you are broadly asking if they are enjoying their job.

仕事 = work / job
楽しい = fun

This is a very common phrase when discussing a persons job. It is a good question to ask early in the conversation, inviting the person you are speaking with to confirm or deny the statement and giving them an opportunity to share their thoughts.

If you are specifically referring to work they get paid for, you can use either "work" or "job". Otherwise you should just use work.

My first two questions are explicit, common ways to ask someone if they like their job. This is how you would ask if they like going to work everyday.

My third questions is a little more complicated. This asks if they find their job rewarding. In common usage, "rewarding" is used to ask if a person's job gives them satisfaction with their life. It is not necessarily asking about money. For example, someone who works in a low paid job that helps under privileged children succeed may find their job rewarding, despite low pay. This is because the job offers them the satisfaction of helping other people.