Worked on the evcc-io/evcc repository with a focus on backend reliability and data correctness. Addressed a critical issue in the Battery State of Charge calculation, ensuring that reported values are accurately clamped between 0 and 100 percent. This fix improved the integrity of data presented across dashboards and integrations, preventing over-reporting of battery charge. The work involved careful analysis and adjustment of Go code to enhance system reliability without introducing new user-facing features. Emphasized maintenance and test readiness, laying a solid foundation for future development. Utilized Go and backend development skills to deliver robust, production-ready improvements.