Assalamualikum..i'm come from Bangladesh 2 years...

Welcome, and thank you for trusting us
According to the given facts and for clarification purposes, we would like to explain to you,
You can transfer the visit visa to a work visa, but you have to obtain the approval of the ministry of labor and social affairs. Knowing that, the employer / company shall apply for this approval.
Article 42 of the Foreigners residency law in the UAE stipulates on the conditions in which, the foreigner can transfer a visit visa to a tourist one:
The changing of foreigners' status in the country must come under permits for entering the country for visit or work:
The foreigner must obtain an approval from the ministry of labor or an approval from official authorities outside the law scale. This is in order to be registered on the same sponsor whom your visa is attached to. 
Paying the pardon fees from the leaving conditions set by councils of ministers no.6 in 1994, which stipulates in regard of amendments on the payment fees' mechanism in the Administration of passports and citizenship. This is in case of being an employee at the private sector.

Welcome again, and thank you for trusting us

You have to apply for a job that matches your academic qualification and that is consistent with your scientific and practical experience first.

Then, get a contract in this country. After that, go to the embassy to obtain a work visa with the following documents

Valid passport for at least six months

Job contract

A certificate of good conduct

Bank Statement

Booking airline tickets

Paying the visa fees