Marc Dirix developed API integration templates for Sessy P1 Meter and Sessy Smart Battery within the evcc-io/evcc repository, focusing on seamless power and energy management integration. He adopted a template-driven approach using YAML, which streamlined the onboarding process for new hardware and reduced future integration effort. Marc’s work emphasized configuration management and modularity, aligning the integration with real-world energy management use cases. Although the scope was limited to feature delivery over one month, the solution provided a scalable foundation for supporting additional Sessy devices, demonstrating depth in API integration and a clear understanding of configuration-driven development in energy systems.