During February 2026, Francisco Carvajal Brown focused on enhancing the reliability of the time subsystem in the bevyengine/bevy repository. He addressed a critical bug by replacing panicking subtraction with saturating_duration_since in Rust, ensuring safe handling of non-monotonic clock updates and preventing panics during backward time jumps. This change provided a robust solution for edge cases where time moves backward, returning a safe zero-duration delta instead of crashing. Francisco validated the fix through comprehensive testing, including cargo test and manual edge-case checks. His work demonstrated strong skills in Rust, system programming, and testing, improving Bevy’s resilience in simulation environments.