Lubumba is a Zambia-born, South Africa-raised lawyer who is passionate about democracy and the rule of law. She is particularly interested in administrative justice, access to information, and electoral reform. After completing her LL. B degree (cum laude) at the University of the Witwatersrand in Johannesburg, Lubumba practiced at a leading corporate and commercial law firm. She then clerked for Justice Edwin Cameron of the Constitutional Court from 2015-2016. Lubumba is a recipient of the Ismail Mahomed Fellowship (2016-2017), and graduated with an LL. M degree from Harvard Law School in May 2017. During her LL. M, she conducted research analyzing litigation's role in achieving greater political funding transparency in South Africa.