It depends on which series it is. If it is an engineering series, it is a senior engineer. If it is an economic series, it is a senior economist. The "senior technical and economic title" mentioned in the "Measures for Qualification Identification of Construction Project Bidding Agency" issued by the Ministry of Construction refers to senior engineers. If the senior economist does not meet the engineering major, the technical director is the technical guidance expert who specializes in technical control. If a senior economist, senior accountant and senior statistician are not in line with their major, they simply don't understand how budget can be used as a technical director to control the cost of a company.