u/Funny-Plan7770

I got an offer from a US employer as a project manager in a data centre project. my background is Canadian citizen mechanical engineer. now, I'm a bit concerned about the title that it's a project manager not mechanical engineer, however, you have to be a mechanical engineer to do the job. Is that a concern or am I being too stressed for no reason?
Is that a thing that can be taken care of with a strong support letter?
do I need a lawyer to draft this letter?