The internationalization of technology-based firms creates jobs, enhances competitiveness, and promotes market diversification. This study aims to propose and validate a theoretical model that addresses the key factors influencing the internationalization of Brazilian technology-based companies, specifically strategy, knowledge, resources, capabilities, and commitment, as well as the degree of internationalization achieved by these companies. The methodology identifies the main determinants of internationalization to develop a theoretical model representing the relationships between these factors and the degree of internationalization. The model was empirically validated through a survey with Brazilian firms affiliated with the Technological Innovation Park of São José dos Campos, located in the state of São Paulo, using multivariate analysis of primary data. The results indicate that the factors resources, capabilities and commitment, and knowledge, were decisive for successful internationalization. However, the factor strategy did not show a significant influence within the model, suggesting the need for future research into the role of this factor in the internationalization process. This research contributes by proposing a unique theoretical model for the internationalization of technology-based firms.