In November 2025, Oliver Rahner focused on backend development for the evcc-io/evcc repository, addressing authentication reliability by implementing a robust fix to the token refresh flow. He ensured the refresh token was correctly utilized and that the access token expiry aligned with the server’s response, directly improving session continuity and reducing authentication failures for users. Working primarily in Go, Oliver applied his expertise in API development, OAuth, and authentication to deliver a targeted solution that stabilized login processes across clients. His work demonstrated careful attention to code quality and collaboration, resulting in a deeper, more reliable authentication infrastructure.