Damien Courteville focused on improving the reliability of time-reversed event detection in the SciML/DiffEqBase.jl repository. He addressed a subtle bug in the callback system for differential equation solvers, ensuring that backward vector callbacks are correctly triggered when an integration step lands exactly on an event date. Using Julia and applying expertise in numerical analysis, Damien enhanced the min_t calculation to robustly handle both forward and backward time directions. This work increased the accuracy and maintainability of long-running simulations, particularly for reverse-time scenarios, by preventing missed events and ensuring that event detection logic remains correct in exact-step situations.