The phrase "acted as senior" is correct and usable in written English.
It can be used to describe someone who performed the duties or responsibilities typically associated with a senior position, often in a professional context.
Example: "During the project, she acted as senior, guiding the team through complex challenges and ensuring deadlines were met."
Alternatives: "served as senior" or "functioned as senior".
The official said that the team members acted as "senior counsellors" to the Afghan government.
During the course of his 12 years of service at National Medical Care, Mr. Lubrano acted as Senior Vice President, Treasurer, and Director of the firm.
He acted as Senior Magistrate for Selangor and Negri Sambilan from May, 1904, to the end of the following year, and in July, 1906, was given the position which he now occupies.
Shortly after September 11th, he, in addition, acted as Senior Advisor to John C. Whitehead, the Chairman of the Lower Manhattan Development Corporation, the agency responsible for the rebuilding of the former World Trade Center site and the Memorial to the victims of 9/11.
JSJ acted as "senior investigator" planning and observing the project.
KN acted as "senior investigator" planning and observing the project.
We conduct two experiments, in which participants act as senior executives charged with evaluating two business-unit managers.
When the partners consider it appropriate they will take board positions or even act as senior executives at a company.
He will act as senior loan officer, supervising all branch lending, including long- and short-term loans, lines of credit, commercial real estate loans, equipment financing and loans for working capital.
She was also an active member of the Democratic Party, and, late in life, acted as a senior citizen spokesperson.
Prior to starting Seedling, Kara spent close to seven years at IAC where she acted as the Senior Vice President and General Manager of Urbanspoon and Citysearch.
