Tumi served her articles at a Woodmead law firm from 2013, was admitted as an attorney of the High Court in May 2015 and practised there as an Associate until the end of 2018. In January 2019 she founded Motsekuoa Incorporated Attorneys to challenge the idea that quality legal representation is reserved for the wealthy.
Her experience spans civil and commercial litigation, corporate law, labour law and matrimonial and family law, with a specialisation in medical malpractice. She holds an LLB from the University of South Africa and leads a team that includes office manager Dineo Moloko.