Tina Seršen was born in 1981 in Maribor.  She holds a master’s degree in Science of International Relations.

She started her professional career in 2006 at the Ministry of the Economy, where she was professionally involved in working with European policies in the field of energy. In 2008 she coordinated activities in this field during Slovenia's presidency of the Council of the EU. In the years 2009 and 2011/2012, she also temporarily performed the tasks of energy attaché at the Permanent Representation of the Republic of Slovenia to the EU in Brussels.

As an official, she gained extensive experience in the field of legislative and political files at the EU level, international and multilateral relations. In addition to this she was actively participating in special projects, such as the candidacy and establishment of the headquarters of the Agency for the Cooperation of Energy Regulators (ACER) in Slovenia, international arbitration of the Krško Nuclear Power Plant (NEK), European projects of structural reforms in the field of energy and in the comitology committees of the European Commission.

In 2017, she took over the leadership of the sector for legal and international energy affairs at the Ministry of Infrastructure. During this time she hold an important role in creating important strategic documents such as the National Energy Climate Plan (NEPN), the strategy for coal exit and the process of revising domestic energy legislation. In 2021, she coordinated the activities of the Energy Directorate during Slovenia's presidency of the Council of the EU.