Best Data Entry Operator & Specialist – Data Entry Expert A data entry expert, also known as a data preparation and controlling operator is a member of back office staff employed to enter or update business data into a computer system. He collects all diverse data formats for accurately inputting, updating, and maintaining into databases for further use. This role of data entry expert requires a high level of attention to detail, perfect typing speed, and precision to ensure the correctness of the valuable information being entered.