She is Pro-Rector of NOVA University of Lisbon, where she coordinates the sustainability area and the NOVA 4 The Globe platform since November 2021. She teaches at NOVA School of Science and Technology (NOVA FCT) of NOVA University of Lisbon, where she chaired the Department of Environmental Sciences and Engineering from 2017 to 2022.

She is a member of the ethics committee of NOVA FCT. He was a member of the scientific council of NOVA FCT between 2014 and 2020. She coordinated the Energy & Climate group at the CENSE research centre, between 2008 and 2021, dedicated to R&D in climate neutrality and resilience of energy systems. Her studies resulted in more than a dozen pieces of legislation and two vision documents, including the Long-Term Strategy for the carbon neutrality of the Portuguese economy until 2050, submitted to the UNFCCC by the Portuguese government.

Júlia Seixas was recognised by the Nobel Peace Prize of the Nobel Foundation in 2007 for her contribution to the Intergovernmental Panel on Climate Change (IPCC).