Of Manihiki and Rarotongan descent, Rangi was born in Christchurch, New Zealand. She grew up in Napier suburb of Tamatea, and was educated at Tamatea School, Tamatea Intermediate, and Tamatea High School. She studied for a Bachelor of Business Studies at Massey University before working for the Office of the Controller and Auditor-General. In 2008 she became a consultant, and subsequently worked in a range of governance roles.
