During her IDF military service, Zer Katzenstein served as a human resources officer and was honorably discharged with the rank of lieutenant.

[3] In 2020, she founded a creative strategy agency and a school for YouTube professions entitled "yyy".

[7][5] In 2021, she joined the management team at Playtika as head communications officer and senior director.

[3] While vacationing in Eilat with her family, she heard of a gang raping incident that had taken place and decided to organize a protest movement to draw attention to the biased treatment of women".

[12][13][14] On the morning of 29 June 2023, Zer Katzenstein was detained for questioning by police during a protest near the home of the Minister for the Advancement of the Status of Women, May Golan.

According to Zer Katzenstein, the Minister is "single-handedly hurting the ongoing struggle for women's rights in Israel".