The 15th Brazilian Conference on Software: Theory and Practice (CBSoft 2024) was held in Curitiba, Paraná, Brazil, from September 30 to October 04, 2024, under the General Coordination of Andreia Malucelli (PUC-PR) and Sheila Reinehr (PUC-PR), who organized the volumes together with the coordinators of each event. The annals, which concentrate the scientific works approved at the CBSoft 2024 events, are indexed below.

 Core Events:

• Proceedings of the 9th Brazilian Symposium on Systematic and Automated Software Testing (SAST)
• Proceedings of the 18th Brazilian Symposium on Software Components, Architectures, and Reuse (SBCARS)
• Proceedings of the 38th Brazilian Symposium on Software Engineering (SBES)
• Proceedings of the 28th Brazilian Symposium on Programming Languages (SBLP)
• Companion Proceedings of the 15th Brazilian Conference on Software: Theory and Practice (CBSoft)

• Proceedings of the 6th Workshop on Modeling and Simulation of Software-Intensive Systems (MSSiS)
• Proceedings of the 4th Workshop on Open Science Practices for Software Engineering (OpenScienSE)
• Proceedings of the 12th Workshop on Software Visualization, Evolution and Maintenance (VEM)
• Proceedings of the 1st Workshop on Bots in Software Engineering (WBots)