 Dr. Barreiro was a Financial Sector Coordinator at the Central Bank of Ecuador from 1992 to 1994.She was responsible for the supervision and implementation of the Financial Sector Project with the IDB, which included the financial sector and capital markets law, social security reform, and the modernization of other government financial institutions

From 1997 to 1998, Dr. Barreiro served as an economic and financial advisor for the National Council for State Modernization and Privatization (CONAM).In this capacity, she supervised every aspect for company valuations in the privatization of the national telecommunications and electric sector.