The Job Resources and Demands Model shows that working conditions can predict different levels of well-being at work, such as Work Engagement and Work Addiction, two forms of high energy investment in work. Work Engage-ment is the optimal way of functioning for the worker, marked by pleasure in working, and Work Addiction is a symptom of health impairment, where the time invested in work is due to compulsion. This research aimed to identify the network relationship between Work Engagement and Work Addiction with var-iables pointed out by the literature as antecedents: job resources and demands, meaningful work, occupational self-efficacy, job redesign, job redesign opportunities, and personality. For this purpose, two studies were conducted. The first analyzed personal resources, and the second analyzed job resources. Network analysis was performed on the data with their respective variables. Regarding personal resources, meaningful work was the most strongly associated variable with Work Engagement, and extraversion, associated with high levels of neurot-icism, played an important role in the development of Work Addiction. As for job resources and demands, job resources were the main antecedents of Work Engagement, while job demands were the main antecedents of Work Addiction. The study suggests that the main way to promote Work Engagement and prevent Work Addiction is to invest in job resources and reduce job demands.