Since the B1 visa is a business tourist visa intended only for a temporary visit, you are not allowed to accept permanent employment or work in the United States. With this visa type, you’re only allowed to attend a conference, negotiate a contract, settle an estate, or consult with business associates in the U.S. If you wish to apply for a change of status, you will need to prove that you did not initially plan to find a job in the United States and that an unexpected opportunity came your way. This would mean that you will no longer be able to work in your home country and you’ll be required to apply for a different visa.
In case you intend to work as a personal employee or domestic worker on a B1 visa, you will need to obtain an Employment Authorization Document (EAD), also known as a work permit. It is required that your employer is either a U.S. citizen permanently residing abroad or an alien with nonimmigrant status, such as B, E, F, H, I, J, L, M O, P, or Q.