Hire a resume writer who is a gifted Strategic® thinker. The Strategic® I'm referring to here is defined by the CliftonStrengths™ assessment as someone who is gifted to spot relevant patterns and issues. This person can see from A to Z in one blink. They see the big picture and the see multiple paths to get from here to there.
This type of thinking is a gift that someone either has or they don't have. The Strategic® thinking mentioned in the Clifton StrengthsFinder™ cannot be taught.
You might also want to hire a resume writer who does a significant amount of writing as part of their daily activities. The measurable and quantifiable evidence is always helpful. Here's my evidence of my daily writing activity and how it stacks up to others who happen to use the Grammarly tool.
Look for a resume writing professional who has a sufficient enough vocabulary to keep up with the complexity of the vocabulary that might be used in your profession.
Look for a resume writing specialist who understands how to blend technical writing, business writing, and creative writing just right. How will you know if their blend is just right? They'll be able to show you how their past clients have achieved resume writing results like this.