It should state the position, the professional duties in concrete terms, the approximate share of supervisory responsibility, the reporting structure, the work location, and the intended period of employment. Vague phrasing such as leadership responsibilities invites questions the letter could have answered.
Concrete duties, not summary language
Rather than listing responsibilities as headings, ask for sentences describing the work: which assessments are performed, which patient populations, what supervision consists of and how often. Include the number of direct reports if there are any. Keep the letter consistent with the offer, the internal job posting, and anything sent to the state regulator, since inconsistent versions of the same role are difficult to reconcile later.
With dated third-party evidence: client engagement letters, contracts, invoices and self-employment tax records that together show at least three years of professional design work. A translation should not become an opportunity to change pay, duration or duties silently. Keep everything in one folder, keep copies at home, and do not present drafts that differ from the signed version; a discrepancy between two documents invites questions about which one is true. The practical sequence is to settle the qualifying employer and professional role first, then assemble credentials and historical explanations, and finally choose the filing or admission method that matches the travel plan.