Just find a certified professional and don't sweat it. https://nwfa.org/cp-about/ Not the cheap "floor guy".

Ask:

How long the project will take and have them break it down day by day?

Equipment setup? Do they have a planetary sander for the fine sanding? Crucial if, you do not want waves, chatter and dish outs.

How good is their dustless system? You will need to verify with their references.

How many gallons of finish is required for project. Verify information on the manufacturers website.

Of, course years of experience of the guy that will be performing the work. 15 years minimum for the main guy, 25 preferred. You'll need the experience incase obstacles occur.

You can always hire certified contractors. But, it may still be year one for them on the field. I personnally didn't go for certfiaction until year 15. Realized I was in a classroom with a bunch of year one guys.

Thank you, very helpful! Hadn’t considered to ask about the people actually doing the job, since the main guys have been the ones we’re interacting with.

Ciranova Ecofix Plus is another quality finish with 150 years of history. I've found that getting the number of the area rep for a product and contacting him for his thoughts has led to contractors I've been happy to work with.