Worked on the evcc-io/evcc repository, focusing on backend development and API integration using Go. Delivered a feature upgrade for the Zaptec Go 2 charger by introducing a new phase-switch current constant, updating phase-switching logic, and enhancing the installation data model to improve safety and observability for single-phase operation. Addressed reliability by refining error handling in the Zaptec charger integration, specifically suppressing redundant error reports when enable commands were sent multiple times. Refactored installation permission checks and improved data validity, contributing to more stable automated workflows and a smoother customer experience in electric vehicle charging scenarios.