A former Google employee who was laid off while on maternity leave last year has filed suit against the technology giant and its parent company, Alphabet, alleging a pattern of discrimination against workers who took time off for pregnancies and other medical leaves.

The suit alleges Google targeted Paula Byrne for layoff despite having given her positive performance reviews and multiple promotions during her 15 years with the company. It was filed on Dec. 11 in Santa Clara County Superior Court by attorneys Tracy Lemmon of Lemmon Employment Law & Conflict Resolution of Oakland and Maria Bourn of Gomerman/Bourn & Associates of San Francisco.