After working for a French NGO in Asia on labour rights and gender empowerment, Nieves started at the ILO in 2001, as a resource mobilisation officer. From 2004, she worked as a project coordinator for an ILO Local Economic Development program based in Maputo, Mozambique, and later for a Social Dialogue for Peace program based in Dakar, Senegal. From 2008 to 2018, Nieves was an international Consultant based first in Uruguay and later in La Havana, Cuba. She worked on a regular basis for the ILO and other international organisations, particularly in Haiti, as a specialist on knowledge management and program development on decent employment in fragile settings.

In September 2018, Nieves joined ILO’s Coordination Support Unit for Peace and Resilience as an employment for peace specialist in the framework of a joint ILO and Peace Building Support Office (PBSO) program aimed at enhancing the peace responsiveness of employment programs. Nieves holds a BA from McGill University (Montreal, Canada) and a Master degree from the Graduate Institute of International and Development Studies of Geneva. She is French and Spanish, and grew up in Brazil.