Rangi completed her nursing degree in Te Matau a Māui (Hawkes Bay) at Te Aho a Māui (Eastern Institution of Technology). She moved to Tāmaki Makaurau (Auckland) to start her nursing career which began in rehab stroke under the NETP program. She decided she wanted to become more specialised, this is where she began her career in the perioperative department.

Whilst working in the perioperative department under women's health, Rangi identified and experienced culturally unsafe practices. She wrote an article based on lived experiences “A safe environment for Māori patients, starts with a safe environment for Māori Nurses” which highlights the isolation and tokenism Māori nurses experience. This article was published in the NZNO perioperative journal and generated the first letter to the editor in 5 years.

Rangi also won best article of the year at the Perioperative Nurses conference 2022 Christchurch and the article has since been republished in Kai Tiaki 2023. Rangi is now employed as a Kaiārahi Nāhi Clinical Nurse Specialist under the Māori health team working with Māori patients on the planned care pathway awaiting surgery. She is one of two proxies for the Tāmaki Makaurau region for Te Rūnanga o Aotearoa.