Worked on the antmicro/verilator repository to implement a hierarchical threading option that allows independent control over the number of threads used for scheduling hierarchical blocks. This feature introduced a new command-line interface, requiring core changes in C++ to manage threading for hierarchical tasks separately from the main thread count. The work included updates to both user and developer documentation to ensure clarity on the new option. Leveraging skills in compiler development, multithreading, and SystemVerilog, the contribution enhanced simulation performance and resource utilization for large hierarchical designs, addressing scalability challenges and aligning with ongoing improvements in test automation workflows.