What conditions need to be met to apply for a work visa?

Generally speaking, you need to have a legally registered company in the UAE as your employer to sponsor the application. The company must have the corresponding labor quota, and you yourself need to meet the job requirements in terms of education, skills, and experience, etc. If it's an investment-type work visa, you may also need to provide investment proof documents to verify your investment identity and rights in the company. (Adam)