Hire a field engineer. Role and discipline are deliberately separate fields — a mechanical engineer working as a checker is a different hire from a mechanical engineer working as a design lead, even with identical qualifications.
Knowing you need a field engineer is more useful than knowing you need a discipline. It tells the marketplace what the person will do day to day — produce, check, coordinate, inspect or lead — and those are not interchangeable even within one discipline.
Be explicit about the role in your brief. “We need a checker, not a designer” saves everyone a round of misaligned proposals, and it usually changes the rate you should expect to pay in one direction or the other.
This role is in the taxonomy and open for profiles. Post your project stating the role you need — engineers in adjacent roles will be matched and can confirm fit.