She is the Founder and CEO of Anam Technologies, a Dublin-based firm which develops secure SS7 and SMS systems for mobile network operators.
She left Anam in 2003 to start a family and, before returning in 2012, opened a restaurant, a music business, and a media firm.
[2] In 1999, O'Sullivan left Logica to found Anam Technologies Ltd., raising €2m in seed money to develop the firm's text messaging systems.
[6][7] O'Sullivan is a vocal advocate for gender parity in the IT industry, writing articles and giving interviews on the subject.
[3][8][9] She also speaks on the adjustments women and their spouses or partners must make in order to combine motherhood with a corporate career.