Longkumer was the top-ranked candidate recruited to Grade-I of the higher judiciary through an examination conducted by the Gauhati High Court in 2013. As a judicial officer she worked at the District and Session Court in Dimapur and Kohima, courts with highest case pendency. She served as the Registrar of the Kohima Bench of the Gauhati High Court and later appointed as the Secretary (Judicial) in the Law and Department of the Government of Nagaland.[2]
In May 2023, the Gauhati High Court collegium recommended her appointment as a high court judge to the Supreme Court of India. Thereafter, in January 2024, the members of its collegium, then consisting of Justices Dhananjaya Y. Chandrachud, Sanjiv Khanna, and Bhushan Ramkrishna Gavai, recommended her elevation to the Government of India.[3] She was appointed as an additional judge of the Gauhati High Court on 17 February 2025 by the President of India.[4] Her appointment remains for two years from the day she assumes the office.[5] She is stationed at the Kohima Bench of the high court since then.[6]
