The position must be prearranged professional work in a listed USMCA occupation, and the applicant must meet that profession's specific qualification and citizenship requirements. A senior-sounding title is not evidence of either.
Compare duties to the listed criteria directly
Set the actual duty list beside the profession's stated requirements and identify which document supports each qualification. If the employer later changes the role, review the revised duties rather than continuing to rely on the original offer. It is possible that an initial review finds the offered role does not match any listed profession; the paperwork should describe the real job rather than being written to fit a category.
A first review should produce a short claim chart: the proposed occupation, the material duties, the credential rule, and the record that proves each item. Resolve a mismatch before a support letter is signed, because a revised title cannot cure duties that point somewhere else. Hypothetical example: an urban-forestry consultant is hired to assess tree-risk reports, yet the draft letter calls the role a general project lead. The employer should choose whether to describe the technical assessment work accurately or redesign the role; a vague blend makes the classification question harder, not easier. TN remains temporary professional employment for a U.S. employer, not a way for the applicant to run that applicant’s own U.S. venture.