Worked on the getsentry/opentelemetry-js repository to deliver a Span Lifecycle Debugging feature that adds stack traces to warnings when operations are attempted on ended spans. This enhancement, implemented using TypeScript and JavaScript, focused on improving backend observability and error handling by providing more detailed diagnostic information during debugging. The approach included targeted test coverage to ensure that warnings reliably include stack traces, supporting faster triage and reducing investigation time for span lifecycle issues. By enhancing error reporting and debuggability, the work contributed to more reliable tracing operations and streamlined the process of identifying and resolving issues in distributed systems.