Alvero-Al Mahdi began her career at first in Manila as a trainee of the Department of Environment and Natural Resources. She helped in reviving a biologically dead river called Pasig. After six months of finishing up her work on Pasig, she took on the job at Galadari Hoshiery Mills, a textile factory in the United Arabic Emirates as a quality control engineer in 1992. Her employers soon saw that she was overly qualified for the job and soon she promoted from Galadari Hoshiery Mills to Al Futtaim Wimpey Laboratories. She worked her way up to higher positions such as, chemist to civil engineer to Chief Chemist. After working for Al Futtaim Wimpey Laboratories for six years, she was scouted by the Geoscience Testing Laboratories to become a Quality Assurance Officer. Similar to her career in Al Futtaim Wimpey Laboratories, she rose to several promotions to finally the position of CEO of Geoscience Testing Laboratory in 2003.