Saher Imran contributed to the Expensify/App repository by enhancing spreadsheet import validation and improving maintainability within the ImportSpreadsheet component. Using React and TypeScript, Saher centralized file type checks through an allowedExtensions system, unifying validation logic to reduce the risk of invalid file ingestion. The work included a targeted refactor for better code readability, formatting, and ESLint compliance, making future enhancements more straightforward. Saher also ensured continuous integration reliability by re-running CI after changes, maintaining high code quality and test coverage. These efforts focused on data integrity, developer velocity, and sustainable front end development practices without introducing new bugs.