Roos den Hartog has a diverse professional background with roles in research and education, customer service, and childcare. Since April 2021, Roos has served as an Assistant in Research and Education at Erasmus MC, while also working at ANWB Reizen in customer service since April 2022. Previous experience includes being a caregiver for Charly Cares since January 2019 and a contact tracer at TTC Health Services for a brief period in early 2022. Roos's experience in the hospitality sector includes roles at Restaurant Nova and J. & K. Catering from 2020 to 2021. Academically, Roos den Hartog earned a Master’s degree in Forensic and Legal Psychology and a Bachelor's degree in Psychology from Erasmus University Rotterdam, following a VWO education at Melanchthon Bergschenhoek.