Developed and delivered the DeviceModel Diagnostics Enhancement for the EVerest/libocpp repository, focusing on improving error handling and diagnostics within a C++ OCPP library. The feature aggregates all missing required variables into a single, comprehensive error message, enabling users to identify and address configuration issues more efficiently. By centralizing error reporting, the solution accelerates troubleshooting and reduces remediation time, directly supporting higher deployment readiness and lower support overhead. The work demonstrated proficiency in C++ and diagnostics-driven design, with a clear emphasis on proactive error aggregation and end-to-end feature delivery, resulting in measurable improvements to reliability and maintainability for the project.