Stefani Tonković was born in Zagreb, Croatia, July 12, 1995. She graduatet from the Faculty of Chemical Engineering and Technology, University of Zagreb, with Bachelor's degree in Environmental Engineering in 2018 by defending her final thesis titled „Application of ferrates (VI) for removal of priority substances in water“, and received a Master's degree in Environmental Engineering in 2020 at the same insitution by defending her master's thesis titled: „Degradation of memantine in water by UVC/H2O2 and UVA-TiO2 processes“, both unter the mentorship of PhD, professor Ana Lončarić Božić.

Since October 2020, she has been employed as an assistant at the Department of Polymer Engineering and Organic Chemical Technology at the Faculty of Chemical Engineering and Technology, University of Zagreb. Her teaching activities primarily include advanced water treatment technologies and waste management. She actively participates in conducting seminars and laboratory exercises in the Department's courses: Waste Management, Environmental Management Systems, Environmental Impact Assessment, Risk Assessment, Advanced Oxidation Technologies, Environmental Engineering, Surfactants, Dyes and Coating Technologies. She also participates in teaching the mentor-type course - Eco-Engineering Laboratory and the preparation of final and master's theses.

Her research activities are focused on investigating the fate and behavior of new environmental pollutants (such as pharmaceuticals and microplastics) and the possibilities of their removal from water by advanced oxidation technologies (photocatalytic processes, Fenton process) and the application of higher oxidation states of iron.