Antonio Sartori focused on enhancing the reliability and safety of the google/perfetto repository over a two-month period, addressing critical issues in trace processing and error handling. He improved the ArtMethodTokenizer by introducing robust error-first handling for illegal version scenarios, replacing crash primitives with standardized error propagation using C++. In the Trace Processor, Antonio implemented defensive programming techniques to prevent pointer arithmetic overflows, ensuring safe buffer boundary calculations when processing large trace data. His work emphasized bug fixing, error handling, and performance optimization, resulting in more stable runtime behavior and improved maintainability for users analyzing complex trace data in Perfetto.