Khadijah joined the Singapore Legal Service in 2013. She served as an Assistant Registrar of the Supreme Court from 2013 to 2014.
In 2014, at age 30, Khadijah became one of the youngest persons to be appointed as a District Judge of the Family Justice Courts (FJC). She served as a District Judge, Assistant Registrar, and Judge-Mediator of the FJC from 2014 to 2016.
During her time as a judicial officer, Khadijah presided over procedural and substantive hearings in a broad range of civil, commercial, and family matters, including applications for discovery and interrogatories, further and better particulars, striking out, summary judgment, assessment of damages, bankruptcy, child custody, guardianship, maintenance, family violence, and probate and administration.
Khadijah was also a member of the Disciplinary Tribunal Secretariat and Practice Directions Team at the Supreme Court, and a member of the Family Justice Rules Working Party Secretariat and the Family Law Review Working Group Secretariat at the FJC.