Worked on the AliceO2Group/O2Physics repository to address a critical bug in the MftMchMatcher component, focusing on restoring correct covariance ordering within the matching calculations. Applied C++ development skills to identify and resolve the issue, ensuring that covariance values were no longer swapped, which previously led to skewed matching results and impacted downstream data analysis. Emphasized algorithm optimization and data structure management to validate the fix, running regression checks to confirm accurate MFT-MCH matching outcomes without introducing performance regressions. The work enhanced data quality and reliability for subsequent physics analyses, contributing to the PWGDQ initiative during the development period.