Worked on the matsim-org/matsim-libs repository to address a regression affecting simulation accuracy, specifically targeting the inflow capacity calculation within the QueueWithBuffer component. The approach involved reverting a previous modification that had multiplied inflow capacity by the flow capacity factor, thereby restoring the original maxFlowFromFdiag calculation. This correction improved the reliability of simulation outcomes and ensured better alignment with observed car mode share data. The work was implemented in Java, leveraging skills in simulation and software engineering. Code quality was maintained through regression testing and code review, with a clear and traceable commit history supporting ongoing maintainability of the project.