Mingma is practising as an advocate at the High Court of Sikkim and District Court, Gangtok. She is also a consultant for the Human Rights Law Network, Sikkim. She is founder of an organisation called Speak Up Sikkim, which works in the field of stopping child sexual abuse.
She is working extensively on environmental issues, women and child rights, and indigenous community rights. Protecting traditional knowledge is also close to her heart.
Apart from work, she enjoys art and culture.
She did her L.LB. from Sikkim Government Law College, Gangtok, SIkkim and L.LM. (Intellectual Property Rights) from NALSAR, Hyderabad.