Worked on the antmicro/verilator repository to address a critical issue with virtual class inheritance, focusing on improving the accuracy of derived-class identification within the inheritance hierarchy. Applied C++ development and unit testing skills to deliver a correctness fix that ensures virtual inheritance is handled robustly, reducing the risk of misclassification in simulation environments. Supplemented the fix with expanded test coverage, using both C++ and Python scripting to validate edge cases and prevent future regressions. This work enhanced the reliability of Verilator’s simulation capabilities, benefiting downstream users who depend on precise class hierarchy modeling for their hardware design verification workflows.