This study evaluates the feasibility, acceptability, and sustainability of MINDxYOU, a self-guided online psychotherapy program designed to reduce stress and improve the mental well-being of healthcare professionals in the Andalusian public health system. The trial uses a hybrid type 3 effectiveness-implementation design, combining the evaluation of implementation outcomes with observation of clinical effects on stress, anxiety, and depression. The intervention includes mindfulness, compassion, and acceptance-based practices delivered in four online modules over eight weeks. The study will be conducted in two phases: an initial hospital-based pilot and a broader rollout across primary care and hospital centers. Results will help identify how digital mental health interventions can be integrated into routine healthcare settings to support professionals working under high stress.