Is it credible to recruit people to work abroad in Nigeria (especially in building decoration) online?

At present, Nigeria is undergoing large-scale construction, and many China companies are also participating in the project construction in Nigeria, so professional construction engineers are needed. The key to the problem is to see which company is recruiting, and do they have legal recruitment procedures? Because working in Nigeria requires a legal work visa, otherwise it is illegal to work. Don't pay any fees to the agency in advance when applying for a job. If the company hires you, they will go through all the relevant formalities for you.