Robbert worked on expanding the Vaillant Charger Configuration within the evcc-io/evcc repository, focusing on regional expansion to support additional countries. He updated the realm selection logic using YAML to accommodate new regions, enhancing the platform’s configurability for diverse deployments. Leveraging backend development and configuration management skills, Robbert’s changes allowed users from more regions to configure and utilize Vaillant chargers, directly aligning with the product roadmap. The work addressed the need for broader market reach by enabling multi-region support, and the implementation was delivered as a single, well-scoped feature, demonstrating depth in targeted backend configuration and regional logic adaptation.