Worked on the tigerbeetle/tigerbeetle repository to enhance correctness and reliability in account and transfer validation workflows. Focused on resolving a critical assertion error in the two-phase sample path by refining account ID checks and clarifying assertion usage, both in code and documentation. Addressed issues in transfer assertion handling and ensured proper validation of account states, reducing the risk of invalid transfers in production. Updated the README to guide future contributors and prevent regression. Utilized Java for backend development and software testing, contributing to improved stability and maintainability of the core system without introducing new features during the period.