Predicting Job Performance in the Nonprofit Sector: The Role of Self-Efficacy and Type D Personality Traits in Greek Non-governmental Organization Employees

SE and SI emerged as key psychological predictors of performance in the NGO workplace. Interventions that strengthen SE and reduce SI, such as cognitive-behavioral training, peer mentoring, and psychologically safe work climates, may enhance employee effectiveness. These findings are especially relevant for Greek NGOs operating under economic and organizational constraints. Future longitudinal and mixed-methods studies are recommended to explore causal pathways and inform workforce development strategies in mission-driven sectors.