The phrase "a more difficult job" is correct and usable in written English.
You can use it when comparing the difficulty of different jobs or tasks, indicating that one job is harder than another.
Example: "After considering the options, I realized that taking on a more difficult job would help me grow professionally."
Alternatives: "a tougher task" or "a harder position".
Being king, however, is likely to become a more difficult job.
And they were unanimous in the opinion that the prosecutions have made being a police officer a more difficult job.
The world's antitrust and financial regulators may face a more difficult job than before, but their authority is not obviously less than it was.
In this room, where both Gadsden and American flags were flying, no one had a more difficult job than Jason Chaffetz, a congressman from Utah, who spoke on behalf of the Republican ticket; unlike many of the people in the hall, he hadn't been disappointed by the result of the Republican primary.
The State Department has a more difficult job than we do because they are balancing American security interests, American commercial interests, American cultural interests, American exchange interests, a whole range of diplomatic interests, and one of the things that they are putting into that mix is the defense of our fundamental values, human rights and religious freedom and other such things.
Darrell Lawrence Smithsonian National Air And Space Museum Though he went "hand-to-hand with the Taliban" as a military policeman at Guantánamo Bay Naval Base and fought in the gulf war, Darrell Lawrence argues that working as a guard at the Smithsonian National Air and Space Museum in Washington is a more difficult job.
"Those who have to let go do a much more difficult job than the people who go … Your wife has to go on living".
Referring to two other so-called reality television shows, he added: "This is a much more difficult job than filming 'Survivor' or MTV's 'Real World.' On those shows, they tape everything and edit later.
It would be a much more difficult job to step into the role at this point.
I think it is a much more difficult job to get young people not to start in the first place.
That's a much more difficult job, which is why so few people take it on.
