Does Triplebyte do TN visas? They're almost trivially simple to do, so the candidate could take care of it themselves without any help from the sponsoring company.
Careful about TN though. The T in TN is temporary, so it prevents you from applying for say a Greencard or an H1-B (which are attempts to be not temporary).
Disclaimer: IANAL but I recently looked into a lot of this.
TN allows for 3 years per visa and unlimited visa renewals, so as long as you demonstrate that you aren't trying to gain citizenship, the US embassy shouldn't mind.
As a Canadian, I have no interest in becoming a US citizen. On a TN visa you can open bank accounts (including investment), buy cars and real estate and do everything other than start a company. It's incredibly convenient and painless compared to an H1-B.
Most people gunning for H1-Bs want to become US Citizens. Canadians have no such need, we just want to work in the US legally and be able to buy stuff and make investments, all of which you can do easily on a TN.
That's BS. TN doesn't help Canadians with family. Also US CBP can always terminate your TN visa on the border if they "think" you are abusing. H-1B is safer for that reason.
Well, it's not really a law, but attorney has suggested that CBP normally don't terminate H-1B at border vs TN as H-1B does have a dual intent, so they can't just say you have an "immigration intention" to deny your visa at border.
Yup, after a few visits back home US immigration officers have asked me variations on if I was planning on returning to Canada. Regardless of my feelings or intent, the answer is "yes, I plan on returning", especially when a guard is explicitly trying to catch you with intent to immigrate.
Disclaimer: IANAL but I recently looked into a lot of this.