She has been working at the Department since 2015. She graduated law at the University of Zagreb in 2012, and obtained her LL.M. degree at the University of Michigan Law School in 2014 as Hugo Grotius Fellow, having received a full scholarship, a certificate of merit, and a Kouba prize for best paper on European integration. In 2016, she worked as a stagiaire at the Court of Justice of the EU, in the cabinets of Judge Siniša Rodin and Advocate General Eleanor Sharpston. In 2018, she was a Grotius Research Fellow at the University of Michigan Law School. Under a joint mentorship of professor Iris Goldner Lang, University of Zagreb – Faculty of Law, and professor Daniel Halberstam, University of Michigan Law School, she defended her doctoral dissertation entitled “A Realist Account of EU Citizenship” in front of an international defence committee in Zagreb on 5 March 2019 (summa cum laude).
Her academic interests and expertise include EU constitutional law, judicial methodologies and theories of adjudication, EU citizenship and migration law. She participated in a number of conferences and published a number of articles or book chapters on these topics. Her work was published in top journals in EU legal scholarship, such as the European Law Review, European Constitutional Law Review and Common Market Law Review. Her ELRev article on recognition of same-sex marriages of EU citizens was cited by Advocate General Wathelet in his Opinion in Case C-673/16 Coman; while her CYELP article on the EU’s response to the refugee crisis was awarded an Odysseus Network special recognition for outstanding young researchers’ publication in EU asylum and immigration law.
At the University of Zagreb - Faculty of Law, she teaches an undergraduate course and seminar on European public law, a graduate course on EU constitutional law and postgraduate course on methodology of EU law. She also teaches EU constitutional law and internal market law at the master-level programme of the University of Zagreb - Faculty of Political Sciences.
Nika participated in a number of international academic projects. Currently, she is the project leader of Jean Monnet Module "EU Constitutional Law and Methodology", an academic staff member of the Jean Monnet Center of Excellence “EU Global Leadership in the Rule of Law” and a research assistant at the UNESCO Chair on Free Movement of People, Migration and Inter-Cultural Dialogue. Previously, she was also an academic staff member of Jean Monnet Chair 'Global Effects of EU Law' at the University of Zagreb, as well as the Croatian expert team member in the international Odysseus Jean Monnet Network for Immigration and Asylum (project holder: Institute for European Studies of the Université Libre de Bruxelles (ULB)) and the ACTIONES project (Active Charter Training through Interaction Of National ExperienceS; project holder: European University Institute).
Since 2017, she is an Executive Editor of the Croatian Yearbook of European Law and Policy (CYELP), declared the best law journal in Croatia by SCOPUS in 2020.
In 2021, she was also elected as President of the Croatian European Union Studies Association (CEUSA, Croatian affiliate of ECSA).