Professional Engineer would be the most important. Depending on the position, other certificates such as Hazardous Materials Manager may be important.

Thank you for your answer. Do you know any certificate useful for Junior roles?

dpugliesi in addition to bimr's answer: In USA (i cant see where you are from). PE is not a recognised title outside USA (as such) and as far as i understand it its granted state by state in USA?

Best regards, Morten

The European Engineer (Eur Ing, EUR ING) is an international professional qualification for engineers used in many European countries. The title is granted after successful application to a national member of the European Federation of National Engineering Associations (FEANI), which includes representation from many European countries, including much of the European Union. It allows a person who has an engineering degree and usually an engineering professional qualification in one of the member countries to use the qualification in others, but this depends on local legislation.

Not aware of any certificates useful for Junior roles

A junior engineer in the US can start with an EIT certificate as the first step before getting a PE license.