She holds a doctorate from the University of Oxford and a Master of Laws from New York University, where she was awarded the George Colin Award. Devika graduated from the University of Western Australia with a Bachelor of Arts and a Bachelor of Laws with First Class Honours. She served as an Associate to Justice Kenneth Hayne at the High Court of Australia, and as judicial clerk at the International Court of Justice in the Hague. She formerly held lectureships at the University of New South Wales and the University of Birmingham.