Worked on enhancing observability within the langwatch/langwatch repository by delivering middleware tracing with support for a custom tracer provider. Focused on backend and API development using Go, the work involved refactoring tracer initialization to eliminate redundant code and ensure consistent tracer usage throughout the middleware stack. Expanded test coverage validated both functionality and error handling, including the addition of missing test cases and extraction of duplicated variables to package-level constants. Addressed a bug where the middleware previously ignored an explicitly set tracer provider, resulting in improved end-to-end tracing reliability, easier debugging, and reduced maintenance overhead for future development and monitoring.