Avoid an automatic conclusion. The actual duties and professional role need assessment against the listed profession; neither the site label nor a single task settles the whole position.
Describe the mixed assignment accurately
Identify analysis, design judgment, measurements, installation and routine maintenance separately. State the expected time and responsibility for each. Provide the actual scope to the reviewer without deleting hands-on duties. A qualifying licence or degree addresses credentials, while the proposed activities and employment arrangement remain distinct requirements.
TN is limited to a Canadian or Mexican citizen with prearranged activity that fits a listed professional category and the required credentials. A Canadian may seek inspection-based admission or use an employer’s I-129 filing; the arrangement cannot, in substance, be the applicant’s own U.S. self-employment. The first review should produce a duty-and-evidence chart: each proposed task, who directs it, which listed profession is relied on, and the document that supports the point. Start with the signed offer and any customer scope, then test credentials, payment terms, ownership, and the proposed dates against that chart. A polished letter fails when it leaves a contradictory contract, licence record, or ownership document unanswered. Hypothetical example: A seismic-imaging analyst is offered a job mixing subsurface modelling with cable deployment. The duty chart and signed scope, not the analyst title, decide whether the listed role describes the actual assignment. The practical next step is to preserve the underlying record, identify any conflict in writing, and decide the sequence from the facts rather than from a preferred outcome.