A visit or tourist visa does not itself authorise employment or work. Before starting, including a trial period, check the activity’s legal basis, job offer and appropriate permit with the relevant authority.
The employer identified in your contract and permit should match the employment arrangement. Golden residency does not prevent employment: MOHRE provides a work-permit service for establishments hiring Golden Visa holders.
Social-media advertising also engages media regulations. Visitors have a specific advertising-permit route through a licensed advertising agency; a private payment agreement does not replace those requirements or other permissions relevant to the activity.
A practical next step
Before starting, request the job offer and permit details, and verify the authorisation directly through the authority responsible for issuing it.