What procedures and certificates do mainlanders need to work in Hong Kong?

If mainlanders want to work in Hong Kong, they must first be employed by large companies or institutions in Hong Kong. Then the Hong Kong company will apply to the Hong Kong Labour Department and the Immigration Department for your entry work. If it is approved, it will issue your work visa. Then the Hong Kong company will give you the Hong Kong work visa. Holding a work visa issued by the Hong Kong SAR Government, you can apply for a Hong Kong and Macao Pass at the Exit-Entry Department of the Public Security Bureau where you live, and make a work endorsement. You can go to work in Hong Kong when you get your pass and work endorsement. The most important thing is-first of all, there must be big companies and institutions in Hong Kong to hire you. If a Hong Kong company hires you to work in Hong Kong, then almost all the major procedures will be handled by the Hong Kong company in Hong Kong!