Sadie is a Health Psychologist registered with the Health and Care Professions Council (HCPC). She is also a Chartered Psychologist and Associate Fellow of the British Psychological Society (BPS), and a Fellow of the Higher Education Academy (FHEA).

Sadie's research in academic and healthcare settings has included the psychosocial impact of long term conditions and their treatments, and evaluating health services and public health interventions. Sadie held research collaborations at Moorfields Eye Hospital NHS Foundation Trust for six years throughout her PhD and postdoctoral research at City, University of London. Sadie later worked in an applied research role in local government public health advising healthcare teams in the design of service evaluations, leading service evaluations and community engagement projects, and coordinating Islington Council's Qualitative Research and Involvement Network (QRIN). Sadie has also worked as a research consultant. 

Sadie has held a number of teaching roles, including Teaching Assistant for BSc Psychology at Birkbeck, University of London, Module Lead for MSc Health Psychology, Placement Coordinator for Professional Doctorate in Health Psychology, and Visiting Lecturer at City, University of London.