During March 2025, Thunig focused on improving simulation accuracy in the matsim-org/matsim-libs repository by addressing a regression in the QueueWithBuffer inflow capacity calculation. He reverted a previous modification that incorrectly multiplied inflow capacity by the flow capacity factor, restoring the original maxFlowFromFdiag logic to ensure more reliable simulation outcomes and better alignment with observed car mode share data. Working primarily in Java and applying his expertise in simulation and software engineering, Thunig maintained code quality through regression testing and code review. His targeted fix enhanced the reliability of simulation results and preserved clear commit history for future traceability.