Worked on the ministryofjustice/bichard7-next-core repository to enhance reliability in core modules by addressing a persistent UI test flakiness issue. Focused on stabilizing automated tests affected by date range calculations, ensuring consistent results across month boundaries. Refactored backend database transaction handling in TypeScript, removing explicit transaction isolation settings to rely on the default level, which reduced maintenance overhead and improved data consistency. Collaborated with the team to implement these changes in the API layer, leveraging skills in backend development and database management. This work improved continuous integration reliability and increased confidence in test coverage for ongoing development efforts.