Worked on enhancing Chrome tracing accuracy for Windows file I/O within the google/perfetto repository, focusing on both instrumentation and analytics. Developed new filtered I/O opcodes in C++ to ensure start events are reliably emitted for end operations, addressing trace mismatches and improving data fidelity. Implemented Windows ETW disk I/O event parsing in the Perfetto trace processor, introducing a DiskIoTracker class to extract disk number, transfer size, and response time for richer performance analysis. Collaborated across teams to document and validate these changes, establishing a foundation for future Windows ETW enhancements and enabling more detailed observability of Chrome disk operations.