Worked on improving logging reliability in the Azure/azure-functions-core-tools repository by addressing a bug in the ColoredConsoleLogger’s JSON output. Implemented a fix in C# that corrected file creation and append permissions, using File.Open with create and append semantics alongside read-write sharing. This approach removed the need for an explicit file existence check, thereby eliminating race conditions in environments with concurrent writers. The solution enhanced the reliability and observability of JSON logs across local, CI, and production deployments. Demonstrated skills in error handling, file I/O, and logging, with careful attention to cross-platform compatibility and robust multi-writer file access.