Worked on the spring-projects/spring-security repository to enhance observability and reliability in the servlet web layer by addressing trace propagation during error handling. Focused on fixing a traceId discrepancy, the work ensured that trace IDs and parent observations are consistently propagated when errors are dispatched within the web filter chain. This targeted Java development improved end-to-end tracing, particularly in error paths, and aligned with distributed tracing practices. By maintaining consistent tracing across requests, the changes reduced ambiguity during incident investigations. The solution was delivered through clear, focused code changes in Spring Security, leveraging skills in filter chains and observability.