Mattia Pitossi focused on backend reliability and correctness, addressing two critical issues in October 2025. Working in Rust, he contributed to the juspay/hyperswitch repository by correcting the field order in TSYS payment authentication requests, ensuring compliance with API requirements and accurate data transmission. In the tokio-rs/tokio project, he expanded test coverage for asynchronous runtimes, introducing tests that enforce proper local task execution with spawn_local, which helps prevent subtle concurrency bugs. His work emphasized API integration, concurrency, and robust testing practices, resulting in improved payment flow reliability and runtime safety. Over the month, he fixed two bugs and deepened test coverage.