Worked on the AliceO2Group/O2Physics repository to enhance the robustness and reliability of the ProcessRecMC pipeline using C++ for physics simulation and data analysis. Addressed a bug that caused premature termination during event selection by refactoring the logic to use continue statements, ensuring all events were processed and improving Monte Carlo data stability. Introduced a new histogram that compares generated and reconstructed flattenicity, providing clearer data-quality metrics for validation and downstream analytics. These changes increased throughput and consistency in data processing, strengthened the feedback loop for quality control, and supported more reliable analysis workflows within the existing C++ codebase.