Cost Optimization Techniques for Ruby-Based Cloud Applications Using AWS Billing Insights. E-Journal of Science and Emerging Technologies (EJSET), [S. l.], v. 1, n. 3, p. jul (29–40), 2025. Disponível em: https://ejset.org/index.php/ejset/article/view/19. Acesso em: 14 may. 2026.