During October 2025, Mattia Pitossi focused on improving reliability and correctness in backend systems using Rust, with an emphasis on API integration and concurrency. In the juspay/hyperswitch repository, Mattia resolved a payment integration issue by correcting the field order in TSYS authentication requests, ensuring data alignment with external API requirements and reducing the risk of payment errors. In the tokio-rs/tokio project, Mattia expanded test coverage to enforce proper local task execution contexts, preventing subtle concurrency bugs in asynchronous runtimes. This work demonstrated careful attention to system resilience, with targeted bug fixes and robust testing that enhanced production safety and maintainability.