Jurjen focused on stabilizing coal production workflows in the TerraFirmaGreg-Team/Modpack-Modern repository, addressing inconsistencies in recipe outputs and durations. He applied JavaScript data modeling to update and standardize recipe files, removing duplicate entries and aligning production rates with actual coke output. By adjusting input quantities and reverting duration changes to maintain gameplay balance, Jurjen improved the reliability of automation and reduced the risk of production miscounts. His work demonstrated skills in game development, modding, and collaborative version control, resulting in clearer recipe data and easier future maintenance. The depth of changes reflected careful attention to both technical and gameplay balance.