Farina is a Fellow of the Institute of Chartered Accountants Australia and New Zealand. She started her career in 1994 with Coopers & Lybrand, Australia, before returning to Malaysia in 1997 to join PETRONAS where she held various senior positions. Farina was chief financial officer of PETRONAS Carigali Sdn. Bhd, one of the largest subsidiaries of PETRONAS with operations in over 20 countries and has also been Chief Financial Officer at PETRONAS Exploration and Production. From 2013, Farina was the Chief Financial Officer of PETRONAS Chemical Group Berhad, the largest listed entity of PETRONAS. Farina left PETRONAS in 2015 to pursue non-executive opportunities.