Stefan Riegel developed a configurable SG-Ready Input and Bitmask Configuration feature for the evcc-io/evcc repository, focusing on enhancing EMS-ESP’s flexibility across operational modes. By leveraging skills in API integration, configuration management, and embedded systems, Stefan enabled users to define custom SG-Ready inputs and assign bitmask values tailored to specific deployment needs. The implementation, primarily using YAML for configuration, addressed the need for greater customization and alignment with SG-Ready standards, supporting diverse customer requirements. Although the work spanned one month and involved a single feature, it demonstrated depth in technical delivery and thoughtful integration within the existing system architecture.