In August 2025, Jocelyn Zhang focused on backend reliability for the cube-js/cube repository by addressing a parameter casting issue in PrestoDB queries. She implemented explicit CAST operations for boolean and numeric parameters, ensuring that Presto-backed dashboards returned correct results and reducing runtime errors for end users. Her approach included adding targeted tests to verify boolean parameter casting, which helped prevent future regressions and aligned with continuous integration practices. Working primarily with JavaScript and TypeScript, Jocelyn applied her skills in backend development, database querying, and testing to deliver a well-documented, traceable fix that improved the stability of customer-facing analytics workflows.