Fien obtained a masters degree in law at the Catholic University of Leuven in 2018. In 2019 she followed an advanced masters programme in social law at the ULB. In 2022 she followed the course “pension law” at the KU Leuven.

Fien joined the bar of Limburg in 2019. Since september 2022 Fien has been part of the Claeys & Engels team. Fien focuses on various branches of labour law.