Jiri focused on stabilizing the P4 compiler in the p4lang/p4c repository by addressing critical crash scenarios and enhancing error handling. Using C++ and leveraging expertise in compiler design and backend development, Jiri fixed segmentation faults related to v1model version validation and key simplification involving extern calls. The work included improving input validation and clarifying diagnostic messages for action invocations, resulting in a more robust and predictable compiler. Each change was delivered as a well-documented, targeted commit, reflecting careful attention to reliability and maintainability. This depth of work contributed directly to the project’s goals of stability and developer productivity.