Worked on the protocolbuffers/protobuf repository to enhance descriptor validation by implementing a targeted check that rejects symbol names in file descriptors starting with numeric characters. This update focused on improving input validation and error handling in C++, ensuring that invalid naming conventions are caught early in the development process. By providing precise and actionable error messages, the change streamlined debugging and reduced time spent on CI failures. The work demonstrated strong skills in C++ development, unit testing, and protocol buffer internals, ultimately increasing build reliability and helping developers adhere to established naming standards within the codebase.