Jackie focused on improving deployment reliability in the latticexyz/mud repository by addressing a subtle but impactful bug in world deploy state handling. She updated the getWorldDeploy logic to reference the latest block number for the stateBlock, rather than relying on the deploy block’s number, ensuring that the deployment state always reflects the most current blockchain state. This change, implemented using TypeScript and full stack development skills, reduced the risk of state drift and edge-case failures in deployment workflows. While the work was concentrated on a single bug fix, it demonstrated careful attention to correctness and stability in complex distributed systems.