Start by calling it an opportunity (which conjures conveyance and adventure) instead of a job (which conjures baggage and drudgery).

Then find out from the source why the opportunity has been created.  The full answer to this question should include everything you need to describe the opportunity.

Once you have the reasons in hand, remember that you are writing an advertisement and not a design specification.  You want to entice people, not discourage and turn them away.

Avoid stating absolute requirements for the position, as the aggregate of more than 2 or 3 uncommon specialties is likely to exclude everyone on the planet and turn away many a qualified candidate.

Tell the candidate what they will be doing.  Start each bullet point with an action verb, e.g.

• Create design drawings.
• Contribute technical criteria.
• Collaborate with users to write easy-to-use software.

Use keywords in bullet points to attract the desired talent without adamantly requiring specific skills.  That makes for better ad copy and avoids turning away good candidates before you get a chance to interview them.  No matter how specific your needs, given a reasonably good fit with a person's education, the hard fact is that most of what employees need to know is learned on the job.  Given the right general background, a candidate can do just about anything you need them to do if they can read and listen, comprehend what they read, see and hear and act on that comprehension.